78678942 has 16 divisors (see below), whose sum is σ = 157470480. Its totient is φ = 26207552.

The previous prime is 78678917. The next prime is 78678947. The reversal of 78678942 is 24987687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78678947) 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, 6418 + ... + 14090.

It is an arithmetic number, because the mean of its divisors is an integer number (9841905).

Almost surely, 2^78678942 is an apocalyptic number.

78678942 is an abundant number, since it is smaller than the sum of its proper divisors (78791538).

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

78678942 is a wasteful number, since it uses less digits than its factorization.

78678942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9387.

The product of its digits is 1354752, while the sum is 51.

The square root of 78678942 is about 8870.1151063557. The cubic root of 78678942 is about 428.5019840178.

The spelling of 78678942 in words is "seventy-eight million, six hundred seventy-eight thousand, nine hundred forty-two".