71681694 has 32 divisors (see below), whose sum is σ = 167844096. Its totient is φ = 19980480.

The previous prime is 71681689. The next prime is 71681713. The reversal of 71681694 is 49618617.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 19092 + ... + 22535.

It is an arithmetic number, because the mean of its divisors is an integer number (5245128).

Almost surely, 2^71681694 is an apocalyptic number.

71681694 is an abundant number, since it is smaller than the sum of its proper divisors (96162402).

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

71681694 is a wasteful number, since it uses less digits than its factorization.

71681694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41680.

The product of its digits is 72576, while the sum is 42.

The square root of 71681694 is about 8466.5042372871. The cubic root of 71681694 is about 415.4028004754.

The spelling of 71681694 in words is "seventy-one million, six hundred eighty-one thousand, six hundred ninety-four".