78665808 has 40 divisors (see below), whose sum is σ = 218854048. Its totient is φ = 24204672.

The previous prime is 78665803. The next prime is 78665809. The reversal of 78665808 is 80856687.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78665801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62410 + ... + 63657.

Almost surely, 2^78665808 is an apocalyptic number.

78665808 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is an amenable number.

78665808 is an abundant number, since it is smaller than the sum of its proper divisors (140188240).

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

78665808 is a wasteful number, since it uses less digits than its factorization.

78665808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126091 (or 126085 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 48.

The square root of 78665808 is about 8869.3747242971. The cubic root of 78665808 is about 428.4781391867.

The spelling of 78665808 in words is "seventy-eight million, six hundred sixty-five thousand, eight hundred eight".