28172103716428 has 72 divisors (see below), whose sum is σ = 57388266558000. Its totient is φ = 12065780264832.

The previous prime is 28172103716417. The next prime is 28172103716441. The reversal of 28172103716428 is 82461730127182.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2493321523 + ... + 2493332821.

It is an arithmetic number, because the mean of its divisors is an integer number (797059257750).

Almost surely, 2^{28172103716428} is an apocalyptic number.

28172103716428 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28172103716428 is an abundant number, since it is smaller than the sum of its proper divisors (29216162841572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28172103716428 is a wasteful number, since it uses less digits than its factorization.

28172103716428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18599 (or 18590 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 52.

The spelling of 28172103716428 in words is "twenty-eight trillion, one hundred seventy-two billion, one hundred three million, seven hundred sixteen thousand, four hundred twenty-eight".