78087138 has 8 divisors (see below), whose sum is σ = 156174288. Its totient is φ = 26029044.

The previous prime is 78087127. The next prime is 78087161. The reversal of 78087138 is 83178087.

It is a sphenic number, since it is the product of 3 distinct primes.

78087138 is an admirable number.

It is a super-2 number, since 2×78087138² = 12195202242062088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78087138.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6507256 + ... + 6507267.

It is an arithmetic number, because the mean of its divisors is an integer number (19521786).

Almost surely, 2^78087138 is an apocalyptic number.

78087138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

78087138 is a wasteful number, since it uses less digits than its factorization.

78087138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13014528.

The product of its (nonzero) digits is 75264, while the sum is 42.

The square root of 78087138 is about 8836.6927071162. The cubic root of 78087138 is about 427.4249161934.

The spelling of 78087138 in words is "seventy-eight million, eighty-seven thousand, one hundred thirty-eight".