78660879 has 24 divisors (see below), whose sum is σ = 116164608. Its totient is φ = 46952640.

The previous prime is 78660877. The next prime is 78660917. The reversal of 78660879 is 97806687.

It is a happy number.

It is not a de Polignac number, because 78660879 - 2¹ = 78660877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78660871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 574099 + ... + 574235.

It is an arithmetic number, because the mean of its divisors is an integer number (4840192).

Almost surely, 2^78660879 is an apocalyptic number.

78660879 is a deficient number, since it is larger than the sum of its proper divisors (37503729).

78660879 is a wasteful number, since it uses less digits than its factorization.

78660879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415 (or 278 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 51.

The square root of 78660879 is about 8869.0968536825. The cubic root of 78660879 is about 428.4691898820.

It can be divided in two parts, 786608 and 79, that added together give a palindrome (786687).

The spelling of 78660879 in words is "seventy-eight million, six hundred sixty thousand, eight hundred seventy-nine".