31230528 has 112 divisors (see below), whose sum is σ = 99486720. Its totient is φ = 8446464.

The previous prime is 31230499. The next prime is 31230533. The reversal of 31230528 is 82503213.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 31230498 and 31230507.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24925 + ... + 26147.

Almost surely, 2^31230528 is an apocalyptic number.

31230528 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31230528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49743360).

31230528 is an abundant number, since it is smaller than the sum of its proper divisors (68256192).

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

31230528 is a wasteful number, since it uses less digits than its factorization.

31230528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1264 (or 1254 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 31230528 is about 5588.4280437347. The cubic root of 31230528 is about 314.9148270603.

The spelling of 31230528 in words is "thirty-one million, two hundred thirty thousand, five hundred twenty-eight".