78987642 has 32 divisors (see below), whose sum is σ = 161357184. Its totient is φ = 25771200.

The previous prime is 78987641. The next prime is 78987653. The reversal of 78987642 is 24678987.

It is not an unprimeable number, because it can be changed into a prime (78987641) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 66292 + ... + 67472.

It is an arithmetic number, because the mean of its divisors is an integer number (5042412).

Almost surely, 2^78987642 is an apocalyptic number.

78987642 is an abundant number, since it is smaller than the sum of its proper divisors (82369542).

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

78987642 is a wasteful number, since it uses less digits than its factorization.

78987642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414.

The product of its digits is 1354752, while the sum is 51.

The square root of 78987642 is about 8887.4991983122. The cubic root of 78987642 is about 429.0616676093.

The spelling of 78987642 in words is "seventy-eight million, nine hundred eighty-seven thousand, six hundred forty-two".