81506714 has 4 divisors (see below), whose sum is σ = 122260074. Its totient is φ = 40753356.

The previous prime is 81506693. The next prime is 81506771. The reversal of 81506714 is 41760518.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 49210225 + 32296489 = 7015^2 + 5683^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20376677 + ... + 20376680.

Almost surely, 2^81506714 is an apocalyptic number.

81506714 is a deficient number, since it is larger than the sum of its proper divisors (40753360).

81506714 is a wasteful number, since it uses less digits than its factorization.

81506714 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40753359.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 81506714 is about 9028.1068890438. The cubic root of 81506714 is about 433.5752283895.

The spelling of 81506714 in words is "eighty-one million, five hundred six thousand, seven hundred fourteen".