78921583 has 8 divisors (see below), whose sum is σ = 85201200. Its totient is φ = 72671808.

The previous prime is 78921581. The next prime is 78921589. The reversal of 78921583 is 38512987.

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 78921583 - 2¹ = 78921581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78921581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1798 + ... + 12691.

It is an arithmetic number, because the mean of its divisors is an integer number (10650150).

Almost surely, 2^78921583 is an apocalyptic number.

78921583 is a deficient number, since it is larger than the sum of its proper divisors (6279617).

78921583 is a wasteful number, since it uses less digits than its factorization.

78921583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14921.

The product of its digits is 120960, while the sum is 43.

The square root of 78921583 is about 8883.7820211889. The cubic root of 78921583 is about 428.9420231981.

The spelling of 78921583 in words is "seventy-eight million, nine hundred twenty-one thousand, five hundred eighty-three".