28684901952 has 280 divisors, whose sum is σ = 97608233536. Its totient is φ = 8193166848.

The previous prime is 28684901929. The next prime is 28684901953. The reversal of 28684901952 is 25910948682.

It is a happy number.

28684901952 is a `hidden beast` number, since 2 + 8 + 68 + 490 + 1 + 95 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (28684901953) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 8816358 + ... + 8819610.

Almost surely, 2^28684901952 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28684901952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48804116768).

28684901952 is an abundant number, since it is smaller than the sum of its proper divisors (68923331584).

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

28684901952 is an frugal number, since it uses more digits than its factorization.

28684901952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3299 (or 3265 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 54.

The spelling of 28684901952 in words is "twenty-eight billion, six hundred eighty-four million, nine hundred one thousand, nine hundred fifty-two".