72773165 has 4 divisors (see below), whose sum is σ = 87327804. Its totient is φ = 58218528.

The previous prime is 72773153. The next prime is 72773171. The reversal of 72773165 is 56137727.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12524521 + 60248644 = 3539^2 + 7762^2 .

It is a cyclic number.

It is not a de Polignac number, because 72773165 - 2¹⁶ = 72707629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7277312 + ... + 7277321.

It is an arithmetic number, because the mean of its divisors is an integer number (21831951).

Almost surely, 2^72773165 is an apocalyptic number.

It is an amenable number.

72773165 is a deficient number, since it is larger than the sum of its proper divisors (14554639).

72773165 is a wasteful number, since it uses less digits than its factorization.

72773165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14554638.

The product of its digits is 61740, while the sum is 38.

The square root of 72773165 is about 8530.7189028827. The cubic root of 72773165 is about 417.5005844590.

The spelling of 72773165 in words is "seventy-two million, seven hundred seventy-three thousand, one hundred sixty-five".