78428600 has 24 divisors (see below), whose sum is σ = 182346960. Its totient is φ = 31371360.

The previous prime is 78428587. The next prime is 78428617. The reversal of 78428600 is 682487.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 195872 + ... + 196271.

It is an arithmetic number, because the mean of its divisors is an integer number (7597790).

Almost surely, 2^78428600 is an apocalyptic number.

It is an amenable number.

78428600 is an abundant number, since it is smaller than the sum of its proper divisors (103918360).

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

78428600 is a wasteful number, since it uses less digits than its factorization.

78428600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392159 (or 392150 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 78428600 is about 8855.9923215866. The cubic root of 78428600 is about 428.0470295076.

The spelling of 78428600 in words is "seventy-eight million, four hundred twenty-eight thousand, six hundred".