73218765 has 32 divisors (see below), whose sum is σ = 121824000. Its totient is φ = 37506560.

The previous prime is 73218763. The next prime is 73218791. The reversal of 73218765 is 56781237.

It is not a de Polignac number, because 73218765 - 2¹ = 73218763 is a prime.

It is a super-5 number, since 5×73218765⁵ (a number of 41 digits) contains 55555 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73218763) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 121936 + ... + 122534.

It is an arithmetic number, because the mean of its divisors is an integer number (3807000).

Almost surely, 2^73218765 is an apocalyptic number.

It is an amenable number.

73218765 is a deficient number, since it is larger than the sum of its proper divisors (48605235).

73218765 is a wasteful number, since it uses less digits than its factorization.

73218765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917.

The product of its digits is 70560, while the sum is 39.

The square root of 73218765 is about 8556.7964215587. The cubic root of 73218765 is about 418.3509887453.

The spelling of 73218765 in words is "seventy-three million, two hundred eighteen thousand, seven hundred sixty-five".