81534754 has 64 divisors (see below), whose sum is σ = 156017664. Its totient is φ = 31159296.

The previous prime is 81534731. The next prime is 81534781. The reversal of 81534754 is 45743518.

It is a super-2 number, since 2×81534754² = 13295832219681032, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 413784 + ... + 413980.

It is an arithmetic number, because the mean of its divisors is an integer number (2437776).

Almost surely, 2^81534754 is an apocalyptic number.

81534754 is a deficient number, since it is larger than the sum of its proper divisors (74482910).

81534754 is a wasteful number, since it uses less digits than its factorization.

81534754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307.

The product of its digits is 67200, while the sum is 37.

The square root of 81534754 is about 9029.6596835097. The cubic root of 81534754 is about 433.6249423126.

The spelling of 81534754 in words is "eighty-one million, five hundred thirty-four thousand, seven hundred fifty-four".