31428332 has 24 divisors (see below), whose sum is σ = 59388000. Its totient is φ = 14466816.

The previous prime is 31428329. The next prime is 31428343. The reversal of 31428332 is 23382413.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30644 + ... + 31652.

It is an arithmetic number, because the mean of its divisors is an integer number (2474500).

Almost surely, 2^31428332 is an apocalyptic number.

It is an amenable number.

31428332 is a deficient number, since it is larger than the sum of its proper divisors (27959668).

31428332 is a wasteful number, since it uses less digits than its factorization.

31428332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1625 (or 1623 counting only the distinct ones).

The product of its digits is 3456, while the sum is 26.

The square root of 31428332 is about 5606.0977515559. The cubic root of 31428332 is about 315.5782843254.

The spelling of 31428332 in words is "thirty-one million, four hundred twenty-eight thousand, three hundred thirty-two".