77746780 has 36 divisors (see below), whose sum is σ = 173450088. Its totient is φ = 29267200.

The previous prime is 77746771. The next prime is 77746817. The reversal of 77746780 is 8764777.

It is a self number, because there is not a number n which added to its sum of digits gives 77746780.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 946 + ... + 12505.

It is an arithmetic number, because the mean of its divisors is an integer number (4818058).

Almost surely, 2^77746780 is an apocalyptic number.

It is an amenable number.

77746780 is an abundant number, since it is smaller than the sum of its proper divisors (95703308).

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

77746780 is a wasteful number, since it uses less digits than its factorization.

77746780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13494 (or 13475 counting only the distinct ones).

The product of its (nonzero) digits is 460992, while the sum is 46.

The square root of 77746780 is about 8817.4134529350. The cubic root of 77746780 is about 426.8030068297.

The spelling of 77746780 in words is "seventy-seven million, seven hundred forty-six thousand, seven hundred eighty".