31428945 has 32 divisors (see below), whose sum is σ = 58819200. Its totient is φ = 15878592.

The previous prime is 31428923. The next prime is 31428959. The reversal of 31428945 is 54982413.

It is not a de Polignac number, because 31428945 - 2⁸ = 31428689 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3562 + ... + 8691.

It is an arithmetic number, because the mean of its divisors is an integer number (1838100).

Almost surely, 2^31428945 is an apocalyptic number.

It is an amenable number.

31428945 is a deficient number, since it is larger than the sum of its proper divisors (27390255).

31428945 is a wasteful number, since it uses less digits than its factorization.

31428945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12286 (or 12280 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 31428945 is about 5606.1524239000. The cubic root of 31428945 is about 315.5803360647.

The spelling of 31428945 in words is "thirty-one million, four hundred twenty-eight thousand, nine hundred forty-five".