28524231 has 20 divisors (see below), whose sum is σ = 42900792. Its totient is φ = 18886608.

The previous prime is 28524227. The next prime is 28524241. The reversal of 28524231 is 13242582.

It is not a de Polignac number, because 28524231 - 2² = 28524227 is a prime.

It is a super-2 number, since 2×28524231² = 1627263508282722, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 28524195 and 28524204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28524241) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11596 + ... + 13838.

Almost surely, 2^28524231 is an apocalyptic number.

28524231 is a deficient number, since it is larger than the sum of its proper divisors (14376561).

28524231 is a wasteful number, since it uses less digits than its factorization.

28524231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2412 (or 2403 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 28524231 is about 5340.8080849250. The cubic root of 28524231 is about 305.5422799203.

The spelling of 28524231 in words is "twenty-eight million, five hundred twenty-four thousand, two hundred thirty-one".