71725840 has 20 divisors (see below), whose sum is σ = 166762764. Its totient is φ = 28690304.

The previous prime is 71725831. The next prime is 71725853. The reversal of 71725840 is 4852717.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7661824 + 64064016 = 2768^2 + 8004^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×71725840² = 10289192247411200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71725796 and 71725805.

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, 448207 + ... + 448366.

Almost surely, 2^71725840 is an apocalyptic number.

It is an amenable number.

71725840 is an abundant number, since it is smaller than the sum of its proper divisors (95036924).

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

71725840 is a wasteful number, since it uses less digits than its factorization.

71725840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 896586 (or 896580 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 71725840 is about 8469.1109332680. The cubic root of 71725840 is about 415.4880598476.

The spelling of 71725840 in words is "seventy-one million, seven hundred twenty-five thousand, eight hundred forty".