28215632736 has 36 divisors (see below), whose sum is σ = 80238206412. Its totient is φ = 9405210816.

The previous prime is 28215632699. The next prime is 28215632747. The reversal of 28215632736 is 63723651282.

28215632736 is a `hidden beast` number, since 2 + 8 + 2 + 1 + 5 + 632 + 7 + 3 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×28215632736² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28215632691 and 28215632700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 48985186 + ... + 48985761.

It is an arithmetic number, because the mean of its divisors is an integer number (2228839067).

Almost surely, 2^28215632736 is an apocalyptic number.

It is an amenable number.

28215632736 is an abundant number, since it is smaller than the sum of its proper divisors (52022573676).

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

28215632736 is a wasteful number, since it uses less digits than its factorization.

28215632736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97970963 (or 97970952 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The spelling of 28215632736 in words is "twenty-eight billion, two hundred fifteen million, six hundred thirty-two thousand, seven hundred thirty-six".