81376456 has 24 divisors (see below), whose sum is σ = 177492870. Its totient is φ = 34875456.

The previous prime is 81376453. The next prime is 81376469. The reversal of 81376456 is 65467318.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 55264356 + 26112100 = 7434^2 + 5110^2 .

It is a super-2 number, since 2×81376456² = 13244255182239872, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81376453) 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 5 ways as a sum of consecutive naturals, for example, 103405 + ... + 104188.

Almost surely, 2^81376456 is an apocalyptic number.

It is an amenable number.

81376456 is an abundant number, since it is smaller than the sum of its proper divisors (96116414).

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

81376456 is a wasteful number, since it uses less digits than its factorization.

81376456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207613 (or 207602 counting only the distinct ones).

The product of its digits is 120960, while the sum is 40.

The square root of 81376456 is about 9020.8899782671. The cubic root of 81376456 is about 433.3441359569.

The spelling of 81376456 in words is "eighty-one million, three hundred seventy-six thousand, four hundred fifty-six".