28131324 has 48 divisors (see below), whose sum is σ = 74417280. Its totient is φ = 8199360.

The previous prime is 28131319. The next prime is 28131329. The reversal of 28131324 is 42313182.

It is an interprime number because it is at equal distance from previous prime (28131319) and next prime (28131329).

It is a junction number, because it is equal to n+sod(n) for n = 28131294 and 28131303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28131329) 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, 1782 + ... + 7709.

It is an arithmetic number, because the mean of its divisors is an integer number (1550360).

Almost surely, 2^28131324 is an apocalyptic number.

It is an amenable number.

28131324 is an abundant number, since it is smaller than the sum of its proper divisors (46285956).

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

28131324 is a wasteful number, since it uses less digits than its factorization.

28131324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9530 (or 9528 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 28131324 is about 5303.8970578246. The cubic root of 28131324 is about 304.1328914604.

The spelling of 28131324 in words is "twenty-eight million, one hundred thirty-one thousand, three hundred twenty-four".