71520424 has 8 divisors (see below), whose sum is σ = 134100810. Its totient is φ = 35760208.

The previous prime is 71520413. The next prime is 71520443. The reversal of 71520424 is 42402517.

It can be written as a sum of positive squares in only one way, i.e., 53728900 + 17791524 = 7330^2 + 4218^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4470019 + ... + 4470034.

Almost surely, 2^71520424 is an apocalyptic number.

It is an amenable number.

71520424 is a deficient number, since it is larger than the sum of its proper divisors (62580386).

71520424 is a wasteful number, since it uses less digits than its factorization.

71520424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8940059 (or 8940055 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 71520424 is about 8456.9748728490. The cubic root of 71520424 is about 415.0910411382.

The spelling of 71520424 in words is "seventy-one million, five hundred twenty thousand, four hundred twenty-four".