31278052 has 24 divisors (see below), whose sum is σ = 59665536. Its totient is φ = 14260128.

The previous prime is 31278041. The next prime is 31278053. The reversal of 31278052 is 25087213.

It is a self number, because there is not a number n which added to its sum of digits gives 31278052.

It is not an unprimeable number, because it can be changed into a prime (31278053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 693 + ... + 7939.

It is an arithmetic number, because the mean of its divisors is an integer number (2486064).

Almost surely, 2^31278052 is an apocalyptic number.

It is an amenable number.

31278052 is a deficient number, since it is larger than the sum of its proper divisors (28387484).

31278052 is a wasteful number, since it uses less digits than its factorization.

31278052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7347 (or 7345 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 31278052 is about 5592.6784280879. The cubic root of 31278052 is about 315.0744831006.

The spelling of 31278052 in words is "thirty-one million, two hundred seventy-eight thousand, fifty-two".