81299376 has 50 divisors (see below), whose sum is σ = 235307732. Its totient is φ = 27099360.

The previous prime is 81299363. The next prime is 81299377. The reversal of 81299376 is 67399218.

It is not an unprimeable number, because it can be changed into a prime (81299377) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 30070 + ... + 32661.

Almost surely, 2^81299376 is an apocalyptic number.

It is an amenable number.

81299376 is an abundant number, since it is smaller than the sum of its proper divisors (154008356).

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

81299376 is a wasteful number, since it uses less digits than its factorization.

81299376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62751 (or 62736 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 81299376 is about 9016.6166603666. The cubic root of 81299376 is about 433.2072711543.

The spelling of 81299376 in words is "eighty-one million, two hundred ninety-nine thousand, three hundred seventy-six".