72415215 has 28 divisors (see below), whose sum is σ = 130294344. Its totient is φ = 38619504.

The previous prime is 72415207. The next prime is 72415219. The reversal of 72415215 is 51251427.

It is not a de Polignac number, because 72415215 - 2³ = 72415207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72415219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 6289 + ... + 13578.

Almost surely, 2^72415215 is an apocalyptic number.

72415215 is a deficient number, since it is larger than the sum of its proper divisors (57879129).

72415215 is an equidigital number, since it uses as much as digits as its factorization.

72415215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19890 (or 19875 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 72415215 is about 8509.7129798836. The cubic root of 72415215 is about 416.8149378091.

The spelling of 72415215 in words is "seventy-two million, four hundred fifteen thousand, two hundred fifteen".