71920957 has 8 divisors (see below), whose sum is σ = 74784600. Its totient is φ = 69082944.

The previous prime is 71920943. The next prime is 71920967. The reversal of 71920957 is 75902917.

It can be written as a sum of positive squares in 4 ways, for example, as 15280281 + 56640676 = 3909^2 + 7526^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71920957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71920967) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 582 + ... + 12007.

It is an arithmetic number, because the mean of its divisors is an integer number (9348075).

Almost surely, 2^71920957 is an apocalyptic number.

It is an amenable number.

71920957 is a deficient number, since it is larger than the sum of its proper divisors (2863643).

71920957 is a wasteful number, since it uses less digits than its factorization.

71920957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12815.

The product of its (nonzero) digits is 39690, while the sum is 40.

The square root of 71920957 is about 8480.6224417787. The cubic root of 71920957 is about 415.8644717690.

The spelling of 71920957 in words is "seventy-one million, nine hundred twenty thousand, nine hundred fifty-seven".