28057728404 has 48 divisors (see below), whose sum is σ = 54336880080. Its totient is φ = 12616826880.

The previous prime is 28057728343. The next prime is 28057728407. The reversal of 28057728404 is 40482775082.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1328748304 + 26728980100 = 36452^2 + 163490^2 .

It is a super-2 number, since 2×28057728404² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28057728407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117944 + ... + 264624.

It is an arithmetic number, because the mean of its divisors is an integer number (1132018335).

Almost surely, 2^28057728404 is an apocalyptic number.

It is an amenable number.

28057728404 is a deficient number, since it is larger than the sum of its proper divisors (26279151676).

28057728404 is a wasteful number, since it uses less digits than its factorization.

28057728404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146828 (or 146826 counting only the distinct ones).

The product of its (nonzero) digits is 1003520, while the sum is 47.

The spelling of 28057728404 in words is "twenty-eight billion, fifty-seven million, seven hundred twenty-eight thousand, four hundred four".