78939800 has 24 divisors (see below), whose sum is σ = 183535500. Its totient is φ = 31575840.

The previous prime is 78939799. The next prime is 78939821. The reversal of 78939800 is 893987.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 197150 + ... + 197549.

Almost surely, 2^78939800 is an apocalyptic number.

It is an amenable number.

78939800 is an abundant number, since it is smaller than the sum of its proper divisors (104595700).

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

78939800 is a wasteful number, since it uses less digits than its factorization.

78939800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394715 (or 394706 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 78939800 is about 8884.8072573354. The cubic root of 78939800 is about 428.9750240385.

The spelling of 78939800 in words is "seventy-eight million, nine hundred thirty-nine thousand, eight hundred".