78398850 has 24 divisors (see below), whose sum is σ = 194429520. Its totient is φ = 20906320.

The previous prime is 78398843. The next prime is 78398851. The reversal of 78398850 is 5889387.

It is a happy number.

It is a super-2 number, since 2×78398850² = 12292759362645000, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78398850.

It is not an unprimeable number, because it can be changed into a prime (78398851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 261180 + ... + 261479.

It is an arithmetic number, because the mean of its divisors is an integer number (8101230).

Almost surely, 2^78398850 is an apocalyptic number.

78398850 is an abundant number, since it is smaller than the sum of its proper divisors (116030670).

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

78398850 is a wasteful number, since it uses less digits than its factorization.

78398850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522674 (or 522669 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 48.

The square root of 78398850 is about 8854.3125086028. The cubic root of 78398850 is about 427.9928995532.

The spelling of 78398850 in words is "seventy-eight million, three hundred ninety-eight thousand, eight hundred fifty".