31368540 has 48 divisors (see below), whose sum is σ = 100380672. Its totient is φ = 7169856.

The previous prime is 31368509. The next prime is 31368551. The reversal of 31368540 is 4586313.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 31368498 and 31368507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36924 + ... + 37763.

It is an arithmetic number, because the mean of its divisors is an integer number (2091264).

Almost surely, 2^31368540 is an apocalyptic number.

31368540 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31368540 is an abundant number, since it is smaller than the sum of its proper divisors (69012132).

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

31368540 is a wasteful number, since it uses less digits than its factorization.

31368540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74706 (or 74704 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 31368540 is about 5600.7624480958. The cubic root of 31368540 is about 315.3780293931.

The spelling of 31368540 in words is "thirty-one million, three hundred sixty-eight thousand, five hundred forty".