28155372 has 48 divisors (see below), whose sum is σ = 77118720. Its totient is φ = 7826112.

The previous prime is 28155367. The next prime is 28155373. The reversal of 28155372 is 27355182.

It is not an unprimeable number, because it can be changed into a prime (28155373) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1422 + ... + 7637.

It is an arithmetic number, because the mean of its divisors is an integer number (1606640).

Almost surely, 2^28155372 is an apocalyptic number.

It is an amenable number.

28155372 is an abundant number, since it is smaller than the sum of its proper divisors (48963348).

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

28155372 is a wasteful number, since it uses less digits than its factorization.

28155372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9110 (or 9108 counting only the distinct ones).

The product of its digits is 16800, while the sum is 33.

The square root of 28155372 is about 5306.1635858688. The cubic root of 28155372 is about 304.2195292205.

It can be divided in two parts, 281553 and 72, that added together give a triangular number (281625 = T₇₅₀).

The spelling of 28155372 in words is "twenty-eight million, one hundred fifty-five thousand, three hundred seventy-two".