73212155 has 8 divisors (see below), whose sum is σ = 88025712. Its totient is φ = 58455648.

The previous prime is 73212143. The next prime is 73212157. The reversal of 73212155 is 55121237.

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 73212155 - 2⁸ = 73211899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73212157) 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, 11384 + ... + 16613.

It is an arithmetic number, because the mean of its divisors is an integer number (11003214).

Almost surely, 2^73212155 is an apocalyptic number.

73212155 is a deficient number, since it is larger than the sum of its proper divisors (14813557).

73212155 is a wasteful number, since it uses less digits than its factorization.

73212155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28525.

The product of its digits is 2100, while the sum is 26.

The square root of 73212155 is about 8556.4101701590. The cubic root of 73212155 is about 418.3383991528.

The spelling of 73212155 in words is "seventy-three million, two hundred twelve thousand, one hundred fifty-five".