28775685952 has 42 divisors (see below), whose sum is σ = 61504652454. Its totient is φ = 13278827520.

The previous prime is 28775685949. The next prime is 28775685973. The reversal of 28775685952 is 25958657782.

It can be written as a sum of positive squares in 3 ways, for example, as 8182287936 + 20593398016 = 90456^2 + 143504^2 .

It is a Harshad number since it is a multiple of its sum of digits (64).

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, 4890052 + ... + 4895932.

It is an arithmetic number, because the mean of its divisors is an integer number (1464396487).

Almost surely, 2^28775685952 is an apocalyptic number.

It is an amenable number.

28775685952 is an abundant number, since it is smaller than the sum of its proper divisors (32728966502).

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

28775685952 is an frugal number, since it uses more digits than its factorization.

28775685952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11787 (or 5896 counting only the distinct ones).

The product of its digits is 84672000, while the sum is 64.

The spelling of 28775685952 in words is "twenty-eight billion, seven hundred seventy-five million, six hundred eighty-five thousand, nine hundred fifty-two".