78660618 has 16 divisors (see below), whose sum is σ = 158880096. Its totient is φ = 25960400.

The previous prime is 78660607. The next prime is 78660619. The reversal of 78660618 is 81606687.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78660618.

It is not an unprimeable number, because it can be changed into a prime (78660619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64296 + ... + 65507.

It is an arithmetic number, because the mean of its divisors is an integer number (9930006).

Almost surely, 2^78660618 is an apocalyptic number.

78660618 is an abundant number, since it is smaller than the sum of its proper divisors (80219478).

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

78660618 is a wasteful number, since it uses less digits than its factorization.

78660618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129909.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 78660618 is about 8869.0821396580. The cubic root of 78660618 is about 428.4687159888.

The spelling of 78660618 in words is "seventy-eight million, six hundred sixty thousand, six hundred eighteen".