28572831 has 60 divisors (see below), whose sum is σ = 51975792. Its totient is φ = 15567552.

The previous prime is 28572823. The next prime is 28572839. The reversal of 28572831 is 13827582.

28572831 is a `hidden beast` number, since 2 + 8 + 572 + 83 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (28572823) and next prime (28572839).

It is not a de Polignac number, because 28572831 - 2³ = 28572823 is a prime.

It is a super-2 number, since 2×28572831² = 1632813342709122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28572839) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 91131 + ... + 91443.

Almost surely, 2^28572831 is an apocalyptic number.

28572831 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28572831 is the 3381-st heptagonal number.

28572831 is a deficient number, since it is larger than the sum of its proper divisors (23402961).

28572831 is a wasteful number, since it uses less digits than its factorization.

28572831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362 (or 346 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 28572831 is about 5345.3560218193. The cubic root of 28572831 is about 305.7157105878.

It can be divided in two parts, 28572 and 831, that added together give a triangular number (29403 = T₂₄₂).

The spelling of 28572831 in words is "twenty-eight million, five hundred seventy-two thousand, eight hundred thirty-one".