28641817620 has 192 divisors, whose sum is σ = 97120477440. Its totient is φ = 6965208576.

The previous prime is 28641817571. The next prime is 28641817649. The reversal of 28641817620 is 2671814682.

28641817620 is a `hidden beast` number, since 2 + 8 + 6 + 4 + 1 + 8 + 17 + 620 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 558082 + ... + 607238.

It is an arithmetic number, because the mean of its divisors is an integer number (505835820).

Almost surely, 2^28641817620 is an apocalyptic number.

28641817620 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 28641817620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48560238720).

28641817620 is an abundant number, since it is smaller than the sum of its proper divisors (68478659820).

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

28641817620 is a wasteful number, since it uses less digits than its factorization.

28641817620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49271 (or 49263 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The spelling of 28641817620 in words is "twenty-eight billion, six hundred forty-one million, eight hundred seventeen thousand, six hundred twenty".