81268752 has 40 divisors (see below), whose sum is σ = 219075264. Its totient is φ = 25911424.

The previous prime is 81268739. The next prime is 81268777. The reversal of 81268752 is 25786218.

It is a super-2 number, since 2×81268752² = 13209220103275008, 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 81268752.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35703 + ... + 37910.

Almost surely, 2^81268752 is an apocalyptic number.

It is an amenable number.

81268752 is an abundant number, since it is smaller than the sum of its proper divisors (137806512).

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

81268752 is a wasteful number, since it uses less digits than its factorization.

81268752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73647 (or 73641 counting only the distinct ones).

The product of its digits is 53760, while the sum is 39.

The square root of 81268752 is about 9014.9183024584. The cubic root of 81268752 is about 433.1528705499.

The spelling of 81268752 in words is "eighty-one million, two hundred sixty-eight thousand, seven hundred fifty-two".