81664302 has 16 divisors (see below), whose sum is σ = 164616192. Its totient is φ = 27006840.

The previous prime is 81664259. The next prime is 81664321. The reversal of 81664302 is 20346618.

It is a super-2 number, since 2×81664302² = 13338116442294408, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81664302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52824 + ... + 54347.

It is an arithmetic number, because the mean of its divisors is an integer number (10288512).

Almost surely, 2^81664302 is an apocalyptic number.

81664302 is an abundant number, since it is smaller than the sum of its proper divisors (82951890).

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

81664302 is a wasteful number, since it uses less digits than its factorization.

81664302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107303.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 81664302 is about 9036.8303071376. The cubic root of 81664302 is about 433.8544784544.

The spelling of 81664302 in words is "eighty-one million, six hundred sixty-four thousand, three hundred two".