78987442 has 16 divisors (see below), whose sum is σ = 122572800. Its totient is φ = 38135520.

The previous prime is 78987413. The next prime is 78987449. The reversal of 78987442 is 24478987.

It is not an unprimeable number, because it can be changed into a prime (78987449) 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 7 ways as a sum of consecutive naturals, for example, 34159 + ... + 36397.

It is an arithmetic number, because the mean of its divisors is an integer number (7660800).

Almost surely, 2^78987442 is an apocalyptic number.

78987442 is a deficient number, since it is larger than the sum of its proper divisors (43585358).

78987442 is a wasteful number, since it uses less digits than its factorization.

78987442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2841.

The product of its digits is 903168, while the sum is 49.

The square root of 78987442 is about 8887.4879465460. The cubic root of 78987442 is about 429.0613054750.

The spelling of 78987442 in words is "seventy-eight million, nine hundred eighty-seven thousand, four hundred forty-two".