28075785156 has 72 divisors (see below), whose sum is σ = 71369736984. Its totient is φ = 9305909760.

The previous prime is 28075785113. The next prime is 28075785161. The reversal of 28075785156 is 65158757082.

It can be written as a sum of positive squares in 4 ways, for example, as 181440900 + 27894344256 = 13470^2 + 167016^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7891330 + ... + 7894886.

It is an arithmetic number, because the mean of its divisors is an integer number (991246347).

Almost surely, 2^28075785156 is an apocalyptic number.

It is an amenable number.

28075785156 is an abundant number, since it is smaller than the sum of its proper divisors (43293951828).

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

28075785156 is a wasteful number, since it uses less digits than its factorization.

28075785156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4741 (or 4736 counting only the distinct ones).

The product of its (nonzero) digits is 4704000, while the sum is 54.

The spelling of 28075785156 in words is "twenty-eight billion, seventy-five million, seven hundred eighty-five thousand, one hundred fifty-six".