72920585 has 4 divisors (see below), whose sum is σ = 87504708. Its totient is φ = 58336464.

The previous prime is 72920581. The next prime is 72920597. The reversal of 72920585 is 58502927.

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 42758521 + 30162064 = 6539^2 + 5492^2 .

It is a cyclic number.

It is not a de Polignac number, because 72920585 - 2² = 72920581 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72920581) 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 3 ways as a sum of consecutive naturals, for example, 7292054 + ... + 7292063.

It is an arithmetic number, because the mean of its divisors is an integer number (21876177).

Almost surely, 2^72920585 is an apocalyptic number.

It is an amenable number.

72920585 is a deficient number, since it is larger than the sum of its proper divisors (14584123).

72920585 is a wasteful number, since it uses less digits than its factorization.

72920585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14584122.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 72920585 is about 8539.3550693246. The cubic root of 72920585 is about 417.7823111215.

The spelling of 72920585 in words is "seventy-two million, nine hundred twenty thousand, five hundred eighty-five".