71857920 has 72 divisors (see below), whose sum is σ = 229508496. Its totient is φ = 19161088.

The previous prime is 71857909. The next prime is 71857931. The reversal of 71857920 is 2975817.

It is an interprime number because it is at equal distance from previous prime (71857909) and next prime (71857931).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5517 + ... + 13196.

It is an arithmetic number, because the mean of its divisors is an integer number (3187618).

Almost surely, 2^71857920 is an apocalyptic number.

It is an amenable number.

71857920 is an abundant number, since it is smaller than the sum of its proper divisors (157650576).

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

71857920 is a wasteful number, since it uses less digits than its factorization.

71857920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18737 (or 18723 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 39.

The square root of 71857920 is about 8476.9050956113. The cubic root of 71857920 is about 415.7429378312.

The spelling of 71857920 in words is "seventy-one million, eight hundred fifty-seven thousand, nine hundred twenty".