31478540 has 12 divisors (see below), whose sum is σ = 66104976. Its totient is φ = 12591408.

The previous prime is 31478521. The next prime is 31478567. The reversal of 31478540 is 4587413.

It is a junction number, because it is equal to n+sod(n) for n = 31478497 and 31478506.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 786944 + ... + 786983.

It is an arithmetic number, because the mean of its divisors is an integer number (5508748).

Almost surely, 2^31478540 is an apocalyptic number.

It is an amenable number.

31478540 is an abundant number, since it is smaller than the sum of its proper divisors (34626436).

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

31478540 is a wasteful number, since it uses less digits than its factorization.

31478540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1573936 (or 1573934 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 31478540 is about 5610.5739456851. The cubic root of 31478540 is about 315.7462445016.

The spelling of 31478540 in words is "thirty-one million, four hundred seventy-eight thousand, five hundred forty".