71557072 has 20 divisors (see below), whose sum is σ = 140713216. Its totient is φ = 35244000.

The previous prime is 71556977. The next prime is 71557081. The reversal of 71557072 is 27075517.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32304 + ... + 34447.

Almost surely, 2^71557072 is an apocalyptic number.

It is an amenable number.

71557072 is a deficient number, since it is larger than the sum of its proper divisors (69156144).

71557072 is a wasteful number, since it uses less digits than its factorization.

71557072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66826 (or 66820 counting only the distinct ones).

The product of its (nonzero) digits is 17150, while the sum is 34.

The square root of 71557072 is about 8459.1413275817. The cubic root of 71557072 is about 415.1619283899.

The spelling of 71557072 in words is "seventy-one million, five hundred fifty-seven thousand, seventy-two".