28408772684 has 24 divisors (see below), whose sum is σ = 51222483648. Its totient is φ = 13779127040.

The previous prime is 28408772683. The next prime is 28408772699. The reversal of 28408772684 is 48627780482.

It is a super-2 number, since 2×28408772684² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28408772683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 647387 + ... + 689874.

It is an arithmetic number, because the mean of its divisors is an integer number (2134270152).

Almost surely, 2^28408772684 is an apocalyptic number.

It is an amenable number.

28408772684 is a deficient number, since it is larger than the sum of its proper divisors (22813710964).

28408772684 is a wasteful number, since it uses less digits than its factorization.

28408772684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1337425 (or 1337423 counting only the distinct ones).

The product of its (nonzero) digits is 9633792, while the sum is 56.

The spelling of 28408772684 in words is "twenty-eight billion, four hundred eight million, seven hundred seventy-two thousand, six hundred eighty-four".