776688990 has 128 divisors (see below), whose sum is σ = 2347729920. Its totient is φ = 159744000.

The previous prime is 776688971. The next prime is 776689037. The reversal of 776688990 is 99886677.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 231646 + ... + 234974.

It is an arithmetic number, because the mean of its divisors is an integer number (18341640).

Almost surely, 2^776688990 is an apocalyptic number.

776688990 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 776688990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1173864960).

776688990 is an abundant number, since it is smaller than the sum of its proper divisors (1571040930).

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

776688990 is a wasteful number, since it uses less digits than its factorization.

776688990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3458.

The product of its (nonzero) digits is 9144576, while the sum is 60.

The square root of 776688990 is about 27869.1404603730. The cubic root of 776688990 is about 919.2120655990.

The spelling of 776688990 in words is "seven hundred seventy-six million, six hundred eighty-eight thousand, nine hundred ninety".