78268818 has 16 divisors (see below), whose sum is σ = 159868800. Its totient is φ = 25534416.

The previous prime is 78268807. The next prime is 78268829. The reversal of 78268818 is 81886287.

It is an interprime number because it is at equal distance from previous prime (78268807) and next prime (78268829).

It is a super-2 number, since 2×78268818² = 12252015742234248, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 138493 + ... + 139056.

It is an arithmetic number, because the mean of its divisors is an integer number (9991800).

Almost surely, 2^78268818 is an apocalyptic number.

78268818 is an abundant number, since it is smaller than the sum of its proper divisors (81599982).

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

78268818 is a wasteful number, since it uses less digits than its factorization.

78268818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277601.

The product of its digits is 344064, while the sum is 48.

The square root of 78268818 is about 8846.9665987840. The cubic root of 78268818 is about 427.7561462098.

The spelling of 78268818 in words is "seventy-eight million, two hundred sixty-eight thousand, eight hundred eighteen".