28497531 has 16 divisors (see below), whose sum is σ = 38862720. Its totient is φ = 18569280.

The previous prime is 28497509. The next prime is 28497551. The reversal of 28497531 is 13579482.

It is not a de Polignac number, because 28497531 - 2⁵ = 28497499 is a prime.

It is a super-2 number, since 2×28497531² = 1624218546191922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28497531.

It is not an unprimeable number, because it can be changed into a prime (28497551) 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, 40896 + ... + 41586.

It is an arithmetic number, because the mean of its divisors is an integer number (2428920).

Almost surely, 2^28497531 is an apocalyptic number.

28497531 is a deficient number, since it is larger than the sum of its proper divisors (10365189).

28497531 is a wasteful number, since it uses less digits than its factorization.

28497531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986.

The product of its digits is 60480, while the sum is 39.

The square root of 28497531 is about 5338.3078779703. The cubic root of 28497531 is about 305.4469162555.

The spelling of 28497531 in words is "twenty-eight million, four hundred ninety-seven thousand, five hundred thirty-one".