77383840 has 24 divisors (see below), whose sum is σ = 182819700. Its totient is φ = 30953472.

The previous prime is 77383829. The next prime is 77383871. The reversal of 77383840 is 4838377.

It can be written as a sum of positive squares in 2 ways, for example, as 68359824 + 9024016 = 8268^2 + 3004^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 77383793 and 77383802.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241665 + ... + 241984.

Almost surely, 2^77383840 is an apocalyptic number.

It is an amenable number.

77383840 is an abundant number, since it is smaller than the sum of its proper divisors (105435860).

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

77383840 is a wasteful number, since it uses less digits than its factorization.

77383840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483664 (or 483656 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 40.

The square root of 77383840 is about 8796.8085121821. The cubic root of 77383840 is about 426.1378322171.

The spelling of 77383840 in words is "seventy-seven million, three hundred eighty-three thousand, eight hundred forty".