778982988 has 54 divisors (see below), whose sum is σ = 2116220988. Its totient is φ = 222373200.

The previous prime is 778982951. The next prime is 778982989. The reversal of 778982988 is 889289877.

It is not an unprimeable number, because it can be changed into a prime (778982989) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 676213 + ... + 677363.

Almost surely, 2^778982988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 778982988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1058110494).

778982988 is an abundant number, since it is smaller than the sum of its proper divisors (1337238000).

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

778982988 is a wasteful number, since it uses less digits than its factorization.

778982988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2323 (or 1163 counting only the distinct ones).

The product of its digits is 32514048, while the sum is 66.

The square root of 778982988 is about 27910.2667131649. The cubic root of 778982988 is about 920.1161589312.

The spelling of 778982988 in words is "seven hundred seventy-eight million, nine hundred eighty-two thousand, nine hundred eighty-eight".