72921523 has 8 divisors (see below), whose sum is σ = 76262400. Its totient is φ = 69594888.

The previous prime is 72921479. The next prime is 72921571. The reversal of 72921523 is 32512927.

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 72921523 - 2²¹ = 70824371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72921623) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 7708 + ... + 14326.

It is an arithmetic number, because the mean of its divisors is an integer number (9532800).

Almost surely, 2^72921523 is an apocalyptic number.

72921523 is a deficient number, since it is larger than the sum of its proper divisors (3340877).

72921523 is a wasteful number, since it uses less digits than its factorization.

72921523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7121.

The product of its digits is 7560, while the sum is 31.

The square root of 72921523 is about 8539.4099913284. The cubic root of 72921523 is about 417.7841024682.

The spelling of 72921523 in words is "seventy-two million, nine hundred twenty-one thousand, five hundred twenty-three".