78539983 has 8 divisors (see below), whose sum is σ = 84214080. Its totient is φ = 72983040.

The previous prime is 78539959. The next prime is 78540031. The reversal of 78539983 is 38993587.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78539983 - 2⁹ = 78539471 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78539983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78539183) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27898 + ... + 30583.

It is an arithmetic number, because the mean of its divisors is an integer number (10526760).

Almost surely, 2^78539983 is an apocalyptic number.

78539983 is a deficient number, since it is larger than the sum of its proper divisors (5674097).

78539983 is a wasteful number, since it uses less digits than its factorization.

78539983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58577.

The product of its digits is 1632960, while the sum is 52.

The square root of 78539983 is about 8862.2786573206. The cubic root of 78539983 is about 428.2495687598.

The spelling of 78539983 in words is "seventy-eight million, five hundred thirty-nine thousand, nine hundred eighty-three".