77782940 has 24 divisors (see below), whose sum is σ = 164254272. Its totient is φ = 30939840.

The previous prime is 77782933. The next prime is 77782961. The reversal of 77782940 is 4928777.

It is a junction number, because it is equal to n+sod(n) for n = 77782891 and 77782900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7124 + ... + 14363.

It is an arithmetic number, because the mean of its divisors is an integer number (6843928).

Almost surely, 2^77782940 is an apocalyptic number.

It is an amenable number.

77782940 is an abundant number, since it is smaller than the sum of its proper divisors (86471332).

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

77782940 is a wasteful number, since it uses less digits than its factorization.

77782940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21677 (or 21675 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 44.

The square root of 77782940 is about 8819.4637025162. The cubic root of 77782940 is about 426.8691652167.

The spelling of 77782940 in words is "seventy-seven million, seven hundred eighty-two thousand, nine hundred forty".