78385770 has 24 divisors (see below), whose sum is σ = 203803236. Its totient is φ = 20902848.

The previous prime is 78385751. The next prime is 78385777. The reversal of 78385770 is 7758387.

78385770 is a `hidden beast` number, since 78 + 3 + 8 + 577 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 75220929 + 3164841 = 8673^2 + 1779^2 .

It is a super-2 number, since 2×78385770² = 12288657876985800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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

It is not an unprimeable number, because it can be changed into a prime (78385777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 435387 + ... + 435566.

Almost surely, 2^78385770 is an apocalyptic number.

78385770 is an abundant number, since it is smaller than the sum of its proper divisors (125417466).

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

78385770 is a wasteful number, since it uses less digits than its factorization.

78385770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870966 (or 870963 counting only the distinct ones).

The product of its (nonzero) digits is 329280, while the sum is 45.

The square root of 78385770 is about 8853.5738546646. The cubic root of 78385770 is about 427.9690962343.

The spelling of 78385770 in words is "seventy-eight million, three hundred eighty-five thousand, seven hundred seventy".