71517612 has 24 divisors (see below), whose sum is σ = 170945712. Its totient is φ = 23257600.

The previous prime is 71517601. The next prime is 71517629. The reversal of 71517612 is 21671517.

It is a super-2 number, since 2×71517612² = 10229537652365088, which contains 22 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 71517612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72189 + ... + 73172.

It is an arithmetic number, because the mean of its divisors is an integer number (7122738).

Almost surely, 2^71517612 is an apocalyptic number.

It is an amenable number.

71517612 is an abundant number, since it is smaller than the sum of its proper divisors (99428100).

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

71517612 is a wasteful number, since it uses less digits than its factorization.

71517612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145409 (or 145407 counting only the distinct ones).

The product of its digits is 2940, while the sum is 30.

The square root of 71517612 is about 8456.8086179126. The cubic root of 71517612 is about 415.0856009612.

The spelling of 71517612 in words is "seventy-one million, five hundred seventeen thousand, six hundred twelve".