28057746664 has 8 divisors (see below), whose sum is σ = 52608275010. Its totient is φ = 14028873328.

The previous prime is 28057746583. The next prime is 28057746697. The reversal of 28057746664 is 46664775082.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 24100078564 + 3957668100 = 155242^2 + 62910^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×28057746664² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1753609159 + ... + 1753609174.

Almost surely, 2^28057746664 is an apocalyptic number.

It is an amenable number.

28057746664 is a deficient number, since it is larger than the sum of its proper divisors (24550528346).

28057746664 is a wasteful number, since it uses less digits than its factorization.

28057746664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3507218339 (or 3507218335 counting only the distinct ones).

The product of its (nonzero) digits is 13547520, while the sum is 55.

The spelling of 28057746664 in words is "twenty-eight billion, fifty-seven million, seven hundred forty-six thousand, six hundred sixty-four".