77968870 has 32 divisors (see below), whose sum is σ = 161828928. Its totient is φ = 26492928.

The previous prime is 77968861. The next prime is 77968889. The reversal of 77968870 is 7886977.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2982 + ... + 12838.

It is an arithmetic number, because the mean of its divisors is an integer number (5057154).

Almost surely, 2^77968870 is an apocalyptic number.

77968870 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

77968870 is an abundant number, since it is smaller than the sum of its proper divisors (83860058).

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

77968870 is a wasteful number, since it uses less digits than its factorization.

77968870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9984.

The product of its (nonzero) digits is 1185408, while the sum is 52.

The square root of 77968870 is about 8829.9983012456. The cubic root of 77968870 is about 427.2090196385.

The spelling of 77968870 in words is "seventy-seven million, nine hundred sixty-eight thousand, eight hundred seventy".