28525031 has 8 divisors (see below), whose sum is σ = 30629664. Its totient is φ = 26467840.

The previous prime is 28525027. The next prime is 28525043. The reversal of 28525031 is 13052582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28525031 - 2² = 28525027 is a prime.

It is a super-2 number, since 2×28525031² = 1627354787101922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28525331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10610 + ... + 13023.

It is an arithmetic number, because the mean of its divisors is an integer number (3828708).

Almost surely, 2^28525031 is an apocalyptic number.

28525031 is a deficient number, since it is larger than the sum of its proper divisors (2104633).

28525031 is a wasteful number, since it uses less digits than its factorization.

28525031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23721.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 28525031 is about 5340.8829794333. The cubic root of 28525031 is about 305.5451363402.

The spelling of 28525031 in words is "twenty-eight million, five hundred twenty-five thousand, thirty-one".