776899440 has 120 divisors (see below), whose sum is σ = 2658445920. Its totient is φ = 203254272.

The previous prime is 776899429. The next prime is 776899441. The reversal of 776899440 is 44998677.

It is a happy number.

776899440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (776899441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27981 + ... + 48339.

It is an arithmetic number, because the mean of its divisors is an integer number (22153716).

Almost surely, 2^776899440 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 776899440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1329222960).

776899440 is an abundant number, since it is smaller than the sum of its proper divisors (1881546480).

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

776899440 is a wasteful number, since it uses less digits than its factorization.

776899440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20431 (or 20422 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The square root of 776899440 is about 27872.9158862147. The cubic root of 776899440 is about 919.2950806850.

The spelling of 776899440 in words is "seven hundred seventy-six million, eight hundred ninety-nine thousand, four hundred forty".