78654878 has 4 divisors (see below), whose sum is σ = 117982320. Its totient is φ = 39327438.

The previous prime is 78654841. The next prime is 78654887. The reversal of 78654878 is 87845687.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87845687 = 193 ⋅455159.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 19663718 + ... + 19663721.

It is an arithmetic number, because the mean of its divisors is an integer number (29495580).

Almost surely, 2^78654878 is an apocalyptic number.

78654878 is a deficient number, since it is larger than the sum of its proper divisors (39327442).

78654878 is a wasteful number, since it uses less digits than its factorization.

78654878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39327441.

The product of its digits is 3010560, while the sum is 53.

The square root of 78654878 is about 8868.7585376985. The cubic root of 78654878 is about 428.4582937033.

The spelling of 78654878 in words is "seventy-eight million, six hundred fifty-four thousand, eight hundred seventy-eight".