71572816 has 20 divisors (see below), whose sum is σ = 158482912. Its totient is φ = 30674016.

The previous prime is 71572807. The next prime is 71572819. The reversal of 71572816 is 61827517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71572819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319410 + ... + 319633.

Almost surely, 2^71572816 is an apocalyptic number.

It is an amenable number.

71572816 is an abundant number, since it is smaller than the sum of its proper divisors (86910096).

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

71572816 is a wasteful number, since it uses less digits than its factorization.

71572816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639058 (or 639052 counting only the distinct ones).

The product of its digits is 23520, while the sum is 37.

The square root of 71572816 is about 8460.0718673070. The cubic root of 71572816 is about 415.1923741581.

The spelling of 71572816 in words is "seventy-one million, five hundred seventy-two thousand, eight hundred sixteen".