78665850 has 48 divisors (see below), whose sum is σ = 216771840. Its totient is φ = 20977200.

The previous prime is 78665831. The next prime is 78665863. The reversal of 78665850 is 5856687.

78665850 is a `hidden beast` number, since 7 + 8 + 66 + 585 + 0 = 666.

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 = 78665796 and 78665805.

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, 27786 + ... + 30485.

It is an arithmetic number, because the mean of its divisors is an integer number (4516080).

Almost surely, 2^78665850 is an apocalyptic number.

78665850 is an abundant number, since it is smaller than the sum of its proper divisors (138105990).

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

78665850 is a wasteful number, since it uses less digits than its factorization.

78665850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58292 (or 58281 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The square root of 78665850 is about 8869.3770919947. The cubic root of 78665850 is about 428.4782154422.

The spelling of 78665850 in words is "seventy-eight million, six hundred sixty-five thousand, eight hundred fifty".