71557612 has 12 divisors (see below), whose sum is σ = 143115280. Its totient is φ = 30667536.

The previous prime is 71557609. The next prime is 71557613. The reversal of 71557612 is 21675517.

It is a happy number.

71557612 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (71557613) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1277787 + ... + 1277842.

Almost surely, 2^71557612 is an apocalyptic number.

It is an amenable number.

71557612 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

71557612 is a wasteful number, since it uses less digits than its factorization.

71557612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2555640 (or 2555638 counting only the distinct ones).

The product of its digits is 14700, while the sum is 34.

The square root of 71557612 is about 8459.1732456547. The cubic root of 71557612 is about 415.1629727166.

The spelling of 71557612 in words is "seventy-one million, five hundred fifty-seven thousand, six hundred twelve".