31097428 has 12 divisors (see below), whose sum is σ = 55686400. Its totient is φ = 15187032.

The previous prime is 31097413. The next prime is 31097431. The reversal of 31097428 is 82479013.

It is a junction number, because it is equal to n+sod(n) for n = 31097393 and 31097402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90228 + ... + 90571.

Almost surely, 2^31097428 is an apocalyptic number.

It is an amenable number.

31097428 is a deficient number, since it is larger than the sum of its proper divisors (24588972).

31097428 is a wasteful number, since it uses less digits than its factorization.

31097428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180846 (or 180844 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 31097428 is about 5576.5067918904. The cubic root of 31097428 is about 314.4668161661.

The spelling of 31097428 in words is "thirty-one million, ninety-seven thousand, four hundred twenty-eight".