71945892 has 18 divisors (see below), whose sum is σ = 181863318. Its totient is φ = 23981952.

The previous prime is 71945891. The next prime is 71945903. The reversal of 71945892 is 29854917.

It can be written as a sum of positive squares in only one way, i.e., 53231616 + 18714276 = 7296^2 + 4326^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×71945892² = 10352422751351328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71945891) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 999213 + ... + 999284.

Almost surely, 2^71945892 is an apocalyptic number.

It is an amenable number.

71945892 is an abundant number, since it is smaller than the sum of its proper divisors (109917426).

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

71945892 is a wasteful number, since it uses less digits than its factorization.

71945892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1998507 (or 1998502 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 71945892 is about 8482.0924305268. The cubic root of 71945892 is about 415.9125262948.

The spelling of 71945892 in words is "seventy-one million, nine hundred forty-five thousand, eight hundred ninety-two".