73665520 has 80 divisors (see below), whose sum is σ = 180488448. Its totient is φ = 27924480.

The previous prime is 73665509. The next prime is 73665521. The reversal of 73665520 is 2556637.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73665521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121057 + ... + 121663.

Almost surely, 2^73665520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 73665520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90244224).

73665520 is an abundant number, since it is smaller than the sum of its proper divisors (106822928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

73665520 is a wasteful number, since it uses less digits than its factorization.

73665520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698 (or 692 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 34.

The square root of 73665520 is about 8582.8619935311. The cubic root of 73665520 is about 419.2001405803.

The spelling of 73665520 in words is "seventy-three million, six hundred sixty-five thousand, five hundred twenty".