28956324690 has 224 divisors, whose sum is σ = 82871294976. Its totient is φ = 7268538240.

The previous prime is 28956324643. The next prime is 28956324701. The reversal of 28956324690 is 9642365982.

It is a happy number.

It is a super-2 number, since 2×28956324690² (a number of 22 digits) contains 22 as substring.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 8359899 + ... + 8363361.

Almost surely, 2^28956324690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28956324690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41435647488).

28956324690 is an abundant number, since it is smaller than the sum of its proper divisors (53914970286).

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

28956324690 is a wasteful number, since it uses less digits than its factorization.

28956324690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3556 (or 3541 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 54.

The spelling of 28956324690 in words is "twenty-eight billion, nine hundred fifty-six million, three hundred twenty-four thousand, six hundred ninety".