77812840 has 32 divisors (see below), whose sum is σ = 200090880. Its totient is φ = 26678592.

The previous prime is 77812807. The next prime is 77812853. The reversal of 77812840 is 4821877.

It is a self number, because there is not a number n which added to its sum of digits gives 77812840.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 138672 + ... + 139231.

It is an arithmetic number, because the mean of its divisors is an integer number (6252840).

Almost surely, 2^77812840 is an apocalyptic number.

77812840 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

77812840 is an abundant number, since it is smaller than the sum of its proper divisors (122278040).

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

77812840 is a wasteful number, since it uses less digits than its factorization.

77812840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277921 (or 277917 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 77812840 is about 8821.1586540545. The cubic root of 77812840 is about 426.9238548139.

The spelling of 77812840 in words is "seventy-seven million, eight hundred twelve thousand, eight hundred forty".