71513812 has 12 divisors (see below), whose sum is σ = 125254080. Its totient is φ = 35726936.

The previous prime is 71513803. The next prime is 71513821. The reversal of 71513812 is 21831517.

It is an interprime number because it is at equal distance from previous prime (71513803) and next prime (71513821).

It is a super-2 number, since 2×71513812² = 10228450613542688, which contains 22 as substring.

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, 1612 + ... + 12067.

It is an arithmetic number, because the mean of its divisors is an integer number (10437840).

Almost surely, 2^71513812 is an apocalyptic number.

It is an amenable number.

71513812 is a deficient number, since it is larger than the sum of its proper divisors (53740268).

71513812 is a wasteful number, since it uses less digits than its factorization.

71513812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14990 (or 14988 counting only the distinct ones).

The product of its digits is 1680, while the sum is 28.

The square root of 71513812 is about 8456.5839438866. The cubic root of 71513812 is about 415.0782491440.

The spelling of 71513812 in words is "seventy-one million, five hundred thirteen thousand, eight hundred twelve".