72871521 has 8 divisors (see below), whose sum is σ = 101386560. Its totient is φ = 46468752.

The previous prime is 72871511. The next prime is 72871529. The reversal of 72871521 is 12517827.

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

It is not a de Polignac number, because 72871521 - 2²¹ = 70774369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72871529) 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, 527986 + ... + 528123.

It is an arithmetic number, because the mean of its divisors is an integer number (12673320).

Almost surely, 2^72871521 is an apocalyptic number.

It is an amenable number.

72871521 is a deficient number, since it is larger than the sum of its proper divisors (28515039).

72871521 is a wasteful number, since it uses less digits than its factorization.

72871521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056135.

The product of its digits is 7840, while the sum is 33.

The square root of 72871521 is about 8536.4817694411. The cubic root of 72871521 is about 417.6885896648.

The spelling of 72871521 in words is "seventy-two million, eight hundred seventy-one thousand, five hundred twenty-one".