31304380 has 24 divisors (see below), whose sum is σ = 68598432. Its totient is φ = 11977152.

The previous prime is 31304347. The next prime is 31304401. The reversal of 31304380 is 8340313.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33567 + ... + 34486.

It is an arithmetic number, because the mean of its divisors is an integer number (2858268).

Almost surely, 2^31304380 is an apocalyptic number.

It is an amenable number.

31304380 is an abundant number, since it is smaller than the sum of its proper divisors (37294052).

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

31304380 is a wasteful number, since it uses less digits than its factorization.

31304380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68085 (or 68083 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 31304380 is about 5595.0317246643. The cubic root of 31304380 is about 315.1628619484.

Adding to 31304380 its reverse (8340313), we get a palindrome (39644693).

It can be divided in two parts, 31304 and 380, that added together give a square (31684 = 178²).

The spelling of 31304380 in words is "thirty-one million, three hundred four thousand, three hundred eighty".