28655237790 has 144 divisors (see below), whose sum is σ = 78814988928. Its totient is φ = 7222317696.

The previous prime is 28655237777. The next prime is 28655237803. The reversal of 28655237790 is 9773255682.

28655237790 is a `hidden beast` number, since 2 + 86 + 552 + 3 + 7 + 7 + 9 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (28655237777) and next prime (28655237803).

It is a super-2 number, since 2×28655237790² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 19720704 + ... + 19722156.

It is an arithmetic number, because the mean of its divisors is an integer number (547326312).

Almost surely, 2^28655237790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28655237790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39407494464).

28655237790 is an abundant number, since it is smaller than the sum of its proper divisors (50159751138).

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

28655237790 is a wasteful number, since it uses less digits than its factorization.

28655237790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2111 (or 2089 counting only the distinct ones).

The product of its (nonzero) digits is 6350400, while the sum is 54.

The spelling of 28655237790 in words is "twenty-eight billion, six hundred fifty-five million, two hundred thirty-seven thousand, seven hundred ninety".