77820008 has 16 divisors (see below), whose sum is σ = 166757280. Its totient is φ = 33351408.

The previous prime is 77820007. The next prime is 77820019. The reversal of 77820008 is 80002877.

It is a happy number.

It is a super-3 number, since 3×77820008³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (77820007) 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 3 ways as a sum of consecutive naturals, for example, 694766 + ... + 694877.

It is an arithmetic number, because the mean of its divisors is an integer number (10422330).

Almost surely, 2^77820008 is an apocalyptic number.

It is an amenable number.

77820008 is an abundant number, since it is smaller than the sum of its proper divisors (88937272).

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

77820008 is a wasteful number, since it uses less digits than its factorization.

77820008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1389656 (or 1389652 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 77820008 is about 8821.5649405307. The cubic root of 77820008 is about 426.9369636026.

The spelling of 77820008 in words is "seventy-seven million, eight hundred twenty thousand, eight".