78690855 has 8 divisors (see below), whose sum is σ = 125905392. Its totient is φ = 41968448.

The previous prime is 78690847. The next prime is 78690881. The reversal of 78690855 is 55809687.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78690855 - 2³ = 78690847 is a prime.

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 in 7 ways as a sum of consecutive naturals, for example, 2623014 + ... + 2623043.

It is an arithmetic number, because the mean of its divisors is an integer number (15738174).

Almost surely, 2^78690855 is an apocalyptic number.

78690855 is a deficient number, since it is larger than the sum of its proper divisors (47214537).

78690855 is a wasteful number, since it uses less digits than its factorization.

78690855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5246065.

The product of its (nonzero) digits is 604800, while the sum is 48.

The square root of 78690855 is about 8870.7866054821. The cubic root of 78690855 is about 428.5236098235.

The spelling of 78690855 in words is "seventy-eight million, six hundred ninety thousand, eight hundred fifty-five".