78379717200 has 120 divisors (see below), whose sum is σ = 265845627648. Its totient is φ = 19671767040.

The previous prime is 78379717189. The next prime is 78379717219. The reversal of 78379717200 is 271797387.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×78379717200² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1900672 + ... + 1941471.

Almost surely, 2^78379717200 is an apocalyptic number.

It is an amenable number.

78379717200 is an abundant number, since it is smaller than the sum of its proper divisors (187465910448).

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

78379717200 is a wasteful number, since it uses less digits than its factorization.

78379717200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3842181 (or 3842170 counting only the distinct ones).

The product of its (nonzero) digits is 1037232, while the sum is 51.

The spelling of 78379717200 in words is "seventy-eight billion, three hundred seventy-nine million, seven hundred seventeen thousand, two hundred".