71924540 has 24 divisors (see below), whose sum is σ = 153604080. Its totient is φ = 28281728.

The previous prime is 71924533. The next prime is 71924561. The reversal of 71924540 is 4542917.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 71924497 and 71924506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29297 + ... + 31656.

It is an arithmetic number, because the mean of its divisors is an integer number (6400170).

Almost surely, 2^71924540 is an apocalyptic number.

It is an amenable number.

71924540 is an abundant number, since it is smaller than the sum of its proper divisors (81679540).

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

71924540 is a wasteful number, since it uses less digits than its factorization.

71924540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61021 (or 61019 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 71924540 is about 8480.8336854345. The cubic root of 71924540 is about 415.8713775802.

The spelling of 71924540 in words is "seventy-one million, nine hundred twenty-four thousand, five hundred forty".