77777940 has 48 divisors (see below), whose sum is σ = 218792448. Its totient is φ = 20644224.

The previous prime is 77777929. The next prime is 77778011. The reversal of 77777940 is 4977777.

It is a self number, because there is not a number n which added to its sum of digits gives 77777940.

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, 10474 + ... + 16286.

It is an arithmetic number, because the mean of its divisors is an integer number (4558176).

Almost surely, 2^77777940 is an apocalyptic number.

It is an amenable number.

77777940 is an abundant number, since it is smaller than the sum of its proper divisors (141014508).

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

77777940 is a wasteful number, since it uses less digits than its factorization.

77777940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6048 (or 6046 counting only the distinct ones).

The product of its (nonzero) digits is 605052, while the sum is 48.

The square root of 77777940 is about 8819.1802340127. The cubic root of 77777940 is about 426.8600184314.

The spelling of 77777940 in words is "seventy-seven million, seven hundred seventy-seven thousand, nine hundred forty".