78542618 has 64 divisors (see below), whose sum is σ = 163814400. Its totient is φ = 27267840.

The previous prime is 78542617. The next prime is 78542627. The reversal of 78542618 is 81624587.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78542617) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48953 + ... + 50531.

It is an arithmetic number, because the mean of its divisors is an integer number (2559600).

Almost surely, 2^78542618 is an apocalyptic number.

78542618 is an abundant number, since it is smaller than the sum of its proper divisors (85271782).

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

78542618 is a wasteful number, since it uses less digits than its factorization.

78542618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1635.

The product of its digits is 107520, while the sum is 41.

The square root of 78542618 is about 8862.4273198712. The cubic root of 78542618 is about 428.2543579340.

The spelling of 78542618 in words is "seventy-eight million, five hundred forty-two thousand, six hundred eighteen".