78815814 has 48 divisors (see below), whose sum is σ = 200045376. Its totient is φ = 20470800.

The previous prime is 78815801. The next prime is 78815833. The reversal of 78815814 is 41851887.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 8952 + ... + 15419.

It is an arithmetic number, because the mean of its divisors is an integer number (4167612).

Almost surely, 2^78815814 is an apocalyptic number.

78815814 is an abundant number, since it is smaller than the sum of its proper divisors (121229562).

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

78815814 is a wasteful number, since it uses less digits than its factorization.

78815814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24401 (or 24394 counting only the distinct ones).

The product of its digits is 71680, while the sum is 42.

The square root of 78815814 is about 8877.8270990147. The cubic root of 78815814 is about 428.7503179229.

It can be divided in two parts, 7881 and 5814, that added together give a triangular number (13695 = T₁₆₅).

The spelling of 78815814 in words is "seventy-eight million, eight hundred fifteen thousand, eight hundred fourteen".