78638850 has 60 divisors (see below), whose sum is σ = 218510754. Its totient is φ = 20969280.

The previous prime is 78638843. The next prime is 78638851. The reversal of 78638850 is 5883687.

78638850 is a `hidden beast` number, since 7 + 8 + 638 + 8 + 5 + 0 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 30239001 + 48399849 = 5499^2 + 6957^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 78638796 and 78638805.

It is not an unprimeable number, because it can be changed into a prime (78638851) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 5659 + ... + 13758.

Almost surely, 2^78638850 is an apocalyptic number.

78638850 is an abundant number, since it is smaller than the sum of its proper divisors (139871904).

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

78638850 is a wasteful number, since it uses less digits than its factorization.

78638850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19441 (or 19427 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 78638850 is about 8867.8548702603. The cubic root of 78638850 is about 428.4291885110.

The spelling of 78638850 in words is "seventy-eight million, six hundred thirty-eight thousand, eight hundred fifty".