71573994 has 24 divisors (see below), whose sum is σ = 155299872. Its totient is φ = 23823720.

The previous prime is 71573993. The next prime is 71574011. The reversal of 71573994 is 49937517.

71573994 is a `hidden beast` number, since 71 + 573 + 9 + 9 + 4 = 666.

It is a super-2 number, since 2×71573994² = 10245673234224072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71573993) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12147 + ... + 17049.

It is an arithmetic number, because the mean of its divisors is an integer number (6470828).

Almost surely, 2^71573994 is an apocalyptic number.

71573994 is an abundant number, since it is smaller than the sum of its proper divisors (83725878).

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

71573994 is a wasteful number, since it uses less digits than its factorization.

71573994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5722 (or 5719 counting only the distinct ones).

The product of its digits is 238140, while the sum is 45.

The square root of 71573994 is about 8460.1414881786. The cubic root of 71573994 is about 415.1946519966.

The spelling of 71573994 in words is "seventy-one million, five hundred seventy-three thousand, nine hundred ninety-four".