78790655 has 16 divisors (see below), whose sum is σ = 96132960. Its totient is φ = 61984128.

The previous prime is 78790637. The next prime is 78790661. The reversal of 78790655 is 55609787.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 78790655 - 2¹⁸ = 78528511 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 (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154541 + ... + 155049.

It is an arithmetic number, because the mean of its divisors is an integer number (6008310).

Almost surely, 2^78790655 is an apocalyptic number.

78790655 is a deficient number, since it is larger than the sum of its proper divisors (17342305).

78790655 is a wasteful number, since it uses less digits than its factorization.

78790655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970.

The product of its (nonzero) digits is 529200, while the sum is 47.

The square root of 78790655 is about 8876.4100288349. The cubic root of 78790655 is about 428.7046922348.

The spelling of 78790655 in words is "seventy-eight million, seven hundred ninety thousand, six hundred fifty-five".