71520172 has 12 divisors (see below), whose sum is σ = 125367480. Its totient is φ = 35700896.

The previous prime is 71520167. The next prime is 71520181. The reversal of 71520172 is 27102517.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12022 + ... + 16957.

It is an arithmetic number, because the mean of its divisors is an integer number (10447290).

Almost surely, 2^71520172 is an apocalyptic number.

It is an amenable number.

71520172 is a deficient number, since it is larger than the sum of its proper divisors (53847308).

71520172 is a wasteful number, since it uses less digits than its factorization.

71520172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29600 (or 29598 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 71520172 is about 8456.9599738913. The cubic root of 71520172 is about 415.0905536175.

Adding to 71520172 its reverse (27102517), we get a palindrome (98622689).

The spelling of 71520172 in words is "seventy-one million, five hundred twenty thousand, one hundred seventy-two".