28961603136 has 84 divisors (see below), whose sum is σ = 86087815632. Its totient is φ = 9653862528.

The previous prime is 28961603093. The next prime is 28961603137. The reversal of 28961603136 is 63130616982.

28961603136 is a `hidden beast` number, since 2 + 8 + 9 + 6 + 1 + 603 + 1 + 36 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 28961603091 and 28961603100.

It is not an unprimeable number, because it can be changed into a prime (28961603137) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 915570 + ... + 946673.

It is an arithmetic number, because the mean of its divisors is an integer number (1024854948).

Almost surely, 2^28961603136 is an apocalyptic number.

It is an amenable number.

28961603136 is an abundant number, since it is smaller than the sum of its proper divisors (57126212496).

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

28961603136 is an equidigital number, since it uses as much as digits as its factorization.

28961603136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1862270 (or 1862248 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The spelling of 28961603136 in words is "twenty-eight billion, nine hundred sixty-one million, six hundred three thousand, one hundred thirty-six".