78649400 has 24 divisors (see below), whose sum is σ = 182860320. Its totient is φ = 31459680.

The previous prime is 78649399. The next prime is 78649427. The reversal of 78649400 is 494687.

It is a happy number.

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, 196424 + ... + 196823.

It is an arithmetic number, because the mean of its divisors is an integer number (7619180).

Almost surely, 2^78649400 is an apocalyptic number.

It is an amenable number.

78649400 is an abundant number, since it is smaller than the sum of its proper divisors (104210920).

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

78649400 is a wasteful number, since it uses less digits than its factorization.

78649400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393263 (or 393254 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 78649400 is about 8868.4496954090. The cubic root of 78649400 is about 428.4483466659.

The spelling of 78649400 in words is "seventy-eight million, six hundred forty-nine thousand, four hundred".