31120428 has 24 divisors (see below), whose sum is σ = 73700032. Its totient is φ = 10218384.

The previous prime is 31120417. The next prime is 31120447. The reversal of 31120428 is 82402113.

It is a super-3 number, since 3×31120428³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18550 + ... + 20157.

Almost surely, 2^31120428 is an apocalyptic number.

It is an amenable number.

31120428 is an abundant number, since it is smaller than the sum of its proper divisors (42579604).

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

31120428 is a wasteful number, since it uses less digits than its factorization.

31120428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38781 (or 38779 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 31120428 is about 5578.5686336192. The cubic root of 31120428 is about 314.5443247666.

The spelling of 31120428 in words is "thirty-one million, one hundred twenty thousand, four hundred twenty-eight".