72521115 has 8 divisors (see below), whose sum is σ = 116033808. Its totient is φ = 38677920.

The previous prime is 72521063. The next prime is 72521117. The reversal of 72521115 is 51112527.

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

It is not a de Polignac number, because 72521115 - 2⁶ = 72521051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72521117) 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, 2417356 + ... + 2417385.

It is an arithmetic number, because the mean of its divisors is an integer number (14504226).

Almost surely, 2^72521115 is an apocalyptic number.

72521115 is a deficient number, since it is larger than the sum of its proper divisors (43512693).

72521115 is a wasteful number, since it uses less digits than its factorization.

72521115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4834749.

The product of its digits is 700, while the sum is 24.

The square root of 72521115 is about 8515.9330081912. The cubic root of 72521115 is about 417.0180222128.

The spelling of 72521115 in words is "seventy-two million, five hundred twenty-one thousand, one hundred fifteen".