78407814 has 32 divisors (see below), whose sum is σ = 162132480. Its totient is φ = 25264800.

The previous prime is 78407809. The next prime is 78407821. The reversal of 78407814 is 41870487.

It is a super-2 number, since 2×78407814² = 12295570592517192, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 15 ways as a sum of consecutive naturals, for example, 19779 + ... + 23409.

It is an arithmetic number, because the mean of its divisors is an integer number (5066640).

Almost surely, 2^78407814 is an apocalyptic number.

78407814 is an abundant number, since it is smaller than the sum of its proper divisors (83724666).

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

78407814 is a wasteful number, since it uses less digits than its factorization.

78407814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3756.

The product of its (nonzero) digits is 50176, while the sum is 39.

The square root of 78407814 is about 8854.8186881494. The cubic root of 78407814 is about 428.0092109410.

The spelling of 78407814 in words is "seventy-eight million, four hundred seven thousand, eight hundred fourteen".