78582138 has 16 divisors (see below), whose sum is σ = 165436320. Its totient is φ = 24815376.

The previous prime is 78582131. The next prime is 78582149. The reversal of 78582138 is 83128587.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 78582138.

It is not an unprimeable number, because it can be changed into a prime (78582131) 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, 344545 + ... + 344772.

It is an arithmetic number, because the mean of its divisors is an integer number (10339770).

Almost surely, 2^78582138 is an apocalyptic number.

78582138 is an abundant number, since it is smaller than the sum of its proper divisors (86854182).

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

78582138 is a wasteful number, since it uses less digits than its factorization.

78582138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689341.

The product of its digits is 107520, while the sum is 42.

The square root of 78582138 is about 8864.6566769390. The cubic root of 78582138 is about 428.3261736133.

The spelling of 78582138 in words is "seventy-eight million, five hundred eighty-two thousand, one hundred thirty-eight".