28215402015808 has 56 divisors (see below), whose sum is σ = 65349958516992. Its totient is φ = 11835031839744.

The previous prime is 28215402015767. The next prime is 28215402015919. The reversal of 28215402015808 is 80851020451282.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-2 number, since 2×28215402015808² (a number of 28 digits) contains 22 as substring.

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, 669987541 + ... + 670029652.

Almost surely, 2^{28215402015808} is an apocalyptic number.

28215402015808 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28215402015808 is an abundant number, since it is smaller than the sum of its proper divisors (37134556501184).

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

28215402015808 is a wasteful number, since it uses less digits than its factorization.

28215402015808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340017259 (or 1340017249 counting only the distinct ones).

The product of its (nonzero) digits is 409600, while the sum is 46.

The spelling of 28215402015808 in words is "twenty-eight trillion, two hundred fifteen billion, four hundred two million, fifteen thousand, eight hundred eight".