28108628956 has 48 divisors (see below), whose sum is σ = 53911861920. Its totient is φ = 12776832000.

The previous prime is 28108628941. The next prime is 28108628981. The reversal of 28108628956 is 65982680182.

It is a happy number.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 28108628897 and 28108628906.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116136 + ... + 264016.

It is an arithmetic number, because the mean of its divisors is an integer number (1123163790).

Almost surely, 2^28108628956 is an apocalyptic number.

It is an amenable number.

28108628956 is a deficient number, since it is larger than the sum of its proper divisors (25803232964).

28108628956 is a wasteful number, since it uses less digits than its factorization.

28108628956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148006 (or 148004 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 55.

The spelling of 28108628956 in words is "twenty-eight billion, one hundred eight million, six hundred twenty-eight thousand, nine hundred fifty-six".