31628040 has 32 divisors (see below), whose sum is σ = 94884480. Its totient is φ = 8434112.

The previous prime is 31628021. The next prime is 31628089. The reversal of 31628040 is 4082613.

It is a happy number.

31628040 is nontrivially palindromic in base 9.

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

It is a self number, because there is not a number n which added to its sum of digits gives 31628040.

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 7 ways as a sum of consecutive naturals, for example, 131664 + ... + 131903.

It is an arithmetic number, because the mean of its divisors is an integer number (2965140).

Almost surely, 2^31628040 is an apocalyptic number.

31628040 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31628040 is an abundant number, since it is smaller than the sum of its proper divisors (63256440).

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

31628040 is a wasteful number, since it uses less digits than its factorization.

31628040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263581 (or 263577 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 31628040 is about 5623.8812220743. The cubic root of 31628040 is about 316.2453097046.

The spelling of 31628040 in words is "thirty-one million, six hundred twenty-eight thousand, forty".