78678418 has 24 divisors (see below), whose sum is σ = 147848652. Its totient is φ = 31125024.

The previous prime is 78678401. The next prime is 78678419. The reversal of 78678418 is 81487687.

It can be written as a sum of positive squares in 2 ways, for example, as 66961489 + 11716929 = 8183^2 + 3423^2 .

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (78678419) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29605 + ... + 32152.

Almost surely, 2^78678418 is an apocalyptic number.

78678418 is a deficient number, since it is larger than the sum of its proper divisors (69170234).

78678418 is a wasteful number, since it uses less digits than its factorization.

78678418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61786 (or 61779 counting only the distinct ones).

The product of its digits is 602112, while the sum is 49.

The square root of 78678418 is about 8870.0855689221. The cubic root of 78678418 is about 428.5010327445.

The spelling of 78678418 in words is "seventy-eight million, six hundred seventy-eight thousand, four hundred eighteen".