78983815 has 8 divisors (see below), whose sum is σ = 97838208. Its totient is φ = 61148640.

The previous prime is 78983813. The next prime is 78983867. The reversal of 78983815 is 51838987.

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

It is not a de Polignac number, because 78983815 - 2¹ = 78983813 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 (78983813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254632 + ... + 254941.

It is an arithmetic number, because the mean of its divisors is an integer number (12229776).

Almost surely, 2^78983815 is an apocalyptic number.

78983815 is a deficient number, since it is larger than the sum of its proper divisors (18854393).

78983815 is a wasteful number, since it uses less digits than its factorization.

78983815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509609.

The product of its digits is 483840, while the sum is 49.

The square root of 78983815 is about 8887.2838932938. The cubic root of 78983815 is about 429.0547380632.

The spelling of 78983815 in words is "seventy-eight million, nine hundred eighty-three thousand, eight hundred fifteen".