31488740 has 12 divisors (see below), whose sum is σ = 66126396. Its totient is φ = 12595488.

The previous prime is 31488733. The next prime is 31488767. The reversal of 31488740 is 4788413.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12687844 + 18800896 = 3562^2 + 4336^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31488740.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 787199 + ... + 787238.

It is an arithmetic number, because the mean of its divisors is an integer number (5510533).

Almost surely, 2^31488740 is an apocalyptic number.

It is an amenable number.

31488740 is an abundant number, since it is smaller than the sum of its proper divisors (34637656).

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

31488740 is a wasteful number, since it uses less digits than its factorization.

31488740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1574446 (or 1574444 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 31488740 is about 5611.4828699730. The cubic root of 31488740 is about 315.7803445996.

The spelling of 31488740 in words is "thirty-one million, four hundred eighty-eight thousand, seven hundred forty".