71979725 has 6 divisors (see below), whose sum is σ = 89254890. Its totient is φ = 57583760.

The previous prime is 71979707. The next prime is 71979731. The reversal of 71979725 is 52797917.

It can be written as a sum of positive squares in 3 ways, for example, as 644809 + 71334916 = 803^2 + 8446^2 .

It is not a de Polignac number, because 71979725 - 2¹⁰ = 71978701 is a prime.

It is a super-2 number, since 2×71979725² = 10362161622151250, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71979725.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1439570 + ... + 1439619.

It is an arithmetic number, because the mean of its divisors is an integer number (14875815).

Almost surely, 2^71979725 is an apocalyptic number.

It is an amenable number.

71979725 is a deficient number, since it is larger than the sum of its proper divisors (17275165).

71979725 is a wasteful number, since it uses less digits than its factorization.

71979725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2879199 (or 2879194 counting only the distinct ones).

The product of its digits is 277830, while the sum is 47.

The square root of 71979725 is about 8484.0865742872. The cubic root of 71979725 is about 415.9777112226.

The spelling of 71979725 in words is "seventy-one million, nine hundred seventy-nine thousand, seven hundred twenty-five".