72215170 has 16 divisors (see below), whose sum is σ = 135639360. Its totient is φ = 27630064.

The previous prime is 72215159. The next prime is 72215173. The reversal of 72215170 is 7151227.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (72215173) 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, 156760 + ... + 157219.

It is an arithmetic number, because the mean of its divisors is an integer number (8477460).

Almost surely, 2^72215170 is an apocalyptic number.

72215170 is a deficient number, since it is larger than the sum of its proper divisors (63424190).

72215170 is a wasteful number, since it uses less digits than its factorization.

72215170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314009.

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 72215170 is about 8497.9509294888. The cubic root of 72215170 is about 416.4307706503.

Adding to 72215170 its reverse (7151227), we get a palindrome (79366397).

The spelling of 72215170 in words is "seventy-two million, two hundred fifteen thousand, one hundred seventy".