778828680 has 96 divisors (see below), whose sum is σ = 2892801600. Its totient is φ = 178017408.

The previous prime is 778828649. The next prime is 778828723. The reversal of 778828680 is 86828877.

It is a super-2 number, since 2×778828680² = 1213148225581084800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 152010 + ... + 157049.

It is an arithmetic number, because the mean of its divisors is an integer number (30133350).

Almost surely, 2^778828680 is an apocalyptic number.

778828680 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

778828680 is an abundant number, since it is smaller than the sum of its proper divisors (2113972920).

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

778828680 is a wasteful number, since it uses less digits than its factorization.

778828680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309083 (or 309076 counting only the distinct ones).

The product of its (nonzero) digits is 2408448, while the sum is 54.

The square root of 778828680 is about 27907.5022171458. The cubic root of 778828680 is about 920.0553999405.

The spelling of 778828680 in words is "seven hundred seventy-eight million, eight hundred twenty-eight thousand, six hundred eighty".