28587251772 has 36 divisors (see below), whose sum is σ = 74593262016. Its totient is φ = 9221693760.

The previous prime is 28587251767. The next prime is 28587251783. The reversal of 28587251772 is 27715278582.

It is a happy number.

28587251772 is a `hidden beast` number, since 2 + 8 + 58 + 7 + 2 + 517 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×28587251772³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12806793 + ... + 12809024.

It is an arithmetic number, because the mean of its divisors is an integer number (2072035056).

Almost surely, 2^28587251772 is an apocalyptic number.

It is an amenable number.

28587251772 is an abundant number, since it is smaller than the sum of its proper divisors (46006010244).

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

28587251772 is a wasteful number, since it uses less digits than its factorization.

28587251772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25615858 (or 25615853 counting only the distinct ones).

The product of its digits is 4390400, while the sum is 54.

The spelling of 28587251772 in words is "twenty-eight billion, five hundred eighty-seven million, two hundred fifty-one thousand, seven hundred seventy-two".