81302264 has 16 divisors (see below), whose sum is σ = 154941720. Its totient is φ = 39984480.

The previous prime is 81302237. The next prime is 81302269. The reversal of 81302264 is 46220318.

It is a super-2 number, since 2×81302264² = 13220116263051392, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81302269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82814 + ... + 83789.

Almost surely, 2^81302264 is an apocalyptic number.

It is an amenable number.

81302264 is a deficient number, since it is larger than the sum of its proper divisors (73639456).

81302264 is a wasteful number, since it uses less digits than its factorization.

81302264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166670 (or 166666 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 81302264 is about 9016.7768077068. The cubic root of 81302264 is about 433.2124007048.

The spelling of 81302264 in words is "eighty-one million, three hundred two thousand, two hundred sixty-four".