78819858 has 32 divisors (see below), whose sum is σ = 188630400. Its totient is φ = 24252048.

The previous prime is 78819857. The next prime is 78819859. The reversal of 78819858 is 85891887.

It is an interprime number because it is at equal distance from previous prime (78819857) and next prime (78819859).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (78819857) 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, 55438 + ... + 56841.

It is an arithmetic number, because the mean of its divisors is an integer number (5894700).

Almost surely, 2^78819858 is an apocalyptic number.

78819858 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

78819858 is an abundant number, since it is smaller than the sum of its proper divisors (109810542).

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

78819858 is a wasteful number, since it uses less digits than its factorization.

78819858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112303 (or 112297 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 54.

The square root of 78819858 is about 8878.0548545275. The cubic root of 78819858 is about 428.7576507856.

The spelling of 78819858 in words is "seventy-eight million, eight hundred nineteen thousand, eight hundred fifty-eight".