28639473569280 has 480 divisors, whose sum is σ = 120024074199744. Its totient is φ = 6161096245248.

The previous prime is 28639473569257. The next prime is 28639473569309. The reversal of 28639473569280 is 8296537493682.

It is a happy number.

28639473569280 is a `hidden beast` number, since 2 + 8 + 6 + 39 + 4 + 7 + 3 + 569 + 28 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (480).

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 28639473569199 and 28639473569208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2481067 + ... + 7964586.

Almost surely, 2^{28639473569280} is an apocalyptic number.

28639473569280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28639473569280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60012037099872).

28639473569280 is an abundant number, since it is smaller than the sum of its proper divisors (91384600630464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28639473569280 is a wasteful number, since it uses less digits than its factorization.

28639473569280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10445706 (or 10445687 counting only the distinct ones).

The product of its (nonzero) digits is 940584960, while the sum is 72.

The spelling of 28639473569280 in words is "twenty-eight trillion, six hundred thirty-nine billion, four hundred seventy-three million, five hundred sixty-nine thousand, two hundred eighty".