28057728452 has 24 divisors (see below), whose sum is σ = 52921382976. Its totient is φ = 12939103008.

The previous prime is 28057728449. The next prime is 28057728467. The reversal of 28057728452 is 25482775082.

It is a super-2 number, since 2×28057728452² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28057728452.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156998 + ... + 284189.

It is an arithmetic number, because the mean of its divisors is an integer number (2205057624).

Almost surely, 2^28057728452 is an apocalyptic number.

It is an amenable number.

28057728452 is a deficient number, since it is larger than the sum of its proper divisors (24863654524).

28057728452 is a wasteful number, since it uses less digits than its factorization.

28057728452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442427 (or 442425 counting only the distinct ones).

The product of its (nonzero) digits is 2508800, while the sum is 50.

The spelling of 28057728452 in words is "twenty-eight billion, fifty-seven million, seven hundred twenty-eight thousand, four hundred fifty-two".