31222864 has 10 divisors (see below), whose sum is σ = 60494330. Its totient is φ = 15611424.

The previous prime is 31222861. The next prime is 31222907. The reversal of 31222864 is 46822213.

It can be written as a sum of positive squares in only one way, i.e., 30030400 + 1192464 = 5480^2 + 1092^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31222861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 975699 + ... + 975730.

It is an arithmetic number, because the mean of its divisors is an integer number (6049433).

Almost surely, 2^31222864 is an apocalyptic number.

It is an amenable number.

31222864 is a deficient number, since it is larger than the sum of its proper divisors (29271466).

31222864 is a wasteful number, since it uses less digits than its factorization.

31222864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1951437 (or 1951431 counting only the distinct ones).

The product of its digits is 4608, while the sum is 28.

The square root of 31222864 is about 5587.7422989970. The cubic root of 31222864 is about 314.8890648244.

The spelling of 31222864 in words is "thirty-one million, two hundred twenty-two thousand, eight hundred sixty-four".