72521671 has 8 divisors (see below), whose sum is σ = 74027520. Its totient is φ = 71028408.

The previous prime is 72521653. The next prime is 72521707. The reversal of 72521671 is 17612527.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72521671 - 2⁹ = 72521159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72521621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8970 + ... + 15016.

It is an arithmetic number, because the mean of its divisors is an integer number (9253440).

Almost surely, 2^72521671 is an apocalyptic number.

72521671 is a deficient number, since it is larger than the sum of its proper divisors (1505849).

72521671 is a wasteful number, since it uses less digits than its factorization.

72521671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6293.

The product of its digits is 5880, while the sum is 31.

The square root of 72521671 is about 8515.9656528194. The cubic root of 72521671 is about 417.0190879319.

The spelling of 72521671 in words is "seventy-two million, five hundred twenty-one thousand, six hundred seventy-one".