78369400 has 24 divisors (see below), whose sum is σ = 182209320. Its totient is φ = 31347680.

The previous prime is 78369391. The next prime is 78369407. The reversal of 78369400 is 496387.

It is a super-2 number, since 2×78369400² = 12283525712720000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78369400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78369407) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 195724 + ... + 196123.

It is an arithmetic number, because the mean of its divisors is an integer number (7592055).

Almost surely, 2^78369400 is an apocalyptic number.

It is an amenable number.

78369400 is an abundant number, since it is smaller than the sum of its proper divisors (103839920).

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

78369400 is a wasteful number, since it uses less digits than its factorization.

78369400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391863 (or 391854 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 78369400 is about 8852.6493209660. The cubic root of 78369400 is about 427.9393019580.

The spelling of 78369400 in words is "seventy-eight million, three hundred sixty-nine thousand, four hundred".