31302072 has 32 divisors (see below), whose sum is σ = 86950800. Its totient is φ = 10433952.

The previous prime is 31302067. The next prime is 31302079. The reversal of 31302072 is 27020313.

It is a super-2 number, since 2×31302072² = 1959639422986368, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31302079) 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, 72243 + ... + 72674.

Almost surely, 2^31302072 is an apocalyptic number.

It is an amenable number.

31302072 is an abundant number, since it is smaller than the sum of its proper divisors (55648728).

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

31302072 is a wasteful number, since it uses less digits than its factorization.

31302072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144932 (or 144922 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 31302072 is about 5594.8254664467. The cubic root of 31302072 is about 315.1551163468.

Adding to 31302072 its reverse (27020313), we get a palindrome (58322385).

The spelling of 31302072 in words is "thirty-one million, three hundred two thousand, seventy-two".