73157215 has 4 divisors (see below), whose sum is σ = 87788664. Its totient is φ = 58525768.

The previous prime is 73157209. The next prime is 73157219. The reversal of 73157215 is 51275137.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51275137 = 1051 ⋅48787.

It is a cyclic number.

It is not a de Polignac number, because 73157215 - 2⁹ = 73156703 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73157219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7315717 + ... + 7315726.

It is an arithmetic number, because the mean of its divisors is an integer number (21947166).

Almost surely, 2^73157215 is an apocalyptic number.

73157215 is a deficient number, since it is larger than the sum of its proper divisors (14631449).

73157215 is a wasteful number, since it uses less digits than its factorization.

73157215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14631448.

The product of its digits is 7350, while the sum is 31.

The square root of 73157215 is about 8553.1991091053. The cubic root of 73157215 is about 418.2337295427.

It can be divided in two parts, 7315 and 7215, that multiplied together give a palindrome (52777725).

The spelling of 73157215 in words is "seventy-three million, one hundred fifty-seven thousand, two hundred fifteen".