78633642 has 16 divisors (see below), whose sum is σ = 164105280. Its totient is φ = 25071552.

The previous prime is 78633637. The next prime is 78633661. The reversal of 78633642 is 24633687.

It is a self number, because there is not a number n which added to its sum of digits gives 78633642.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 284767 + ... + 285042.

It is an arithmetic number, because the mean of its divisors is an integer number (10256580).

Almost surely, 2^78633642 is an apocalyptic number.

78633642 is an abundant number, since it is smaller than the sum of its proper divisors (85471638).

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

78633642 is a wasteful number, since it uses less digits than its factorization.

78633642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569837.

The product of its digits is 145152, while the sum is 39.

The square root of 78633642 is about 8867.5612205386. The cubic root of 78633642 is about 428.4197304697.

The spelling of 78633642 in words is "seventy-eight million, six hundred thirty-three thousand, six hundred forty-two".