78729618 has 48 divisors (see below), whose sum is σ = 183284640. Its totient is φ = 22450560.

The previous prime is 78729617. The next prime is 78729619. The reversal of 78729618 is 81692787.

It is an interprime number because it is at equal distance from previous prime (78729617) and next prime (78729619).

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (78729611) 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, 9153 + ... + 15531.

It is an arithmetic number, because the mean of its divisors is an integer number (3818430).

Almost surely, 2^78729618 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78729618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91642320).

78729618 is an abundant number, since it is smaller than the sum of its proper divisors (104555022).

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

78729618 is a wasteful number, since it uses less digits than its factorization.

78729618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6423 (or 6412 counting only the distinct ones).

The product of its digits is 338688, while the sum is 48.

The square root of 78729618 is about 8872.9712047318. The cubic root of 78729618 is about 428.5939616407.

The spelling of 78729618 in words is "seventy-eight million, seven hundred twenty-nine thousand, six hundred eighteen".