71891512 has 32 divisors (see below), whose sum is σ = 168059520. Its totient is φ = 28009440.

The previous prime is 71891507. The next prime is 71891513. The reversal of 71891512 is 21519817.

It is a happy number.

It is a super-2 number, since 2×71891512² = 10336778995292288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71891513) 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, 57738 + ... + 58969.

It is an arithmetic number, because the mean of its divisors is an integer number (5251860).

Almost surely, 2^71891512 is an apocalyptic number.

It is an amenable number.

71891512 is an abundant number, since it is smaller than the sum of its proper divisors (96168008).

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

71891512 is a wasteful number, since it uses less digits than its factorization.

71891512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116731 (or 116727 counting only the distinct ones).

The product of its digits is 5040, while the sum is 34.

The square root of 71891512 is about 8478.8862476153. The cubic root of 71891512 is about 415.8077113042.

The spelling of 71891512 in words is "seventy-one million, eight hundred ninety-one thousand, five hundred twelve".