776069640 has 128 divisors (see below), whose sum is σ = 2642112000. Its totient is φ = 202535424.

The previous prime is 776069639. The next prime is 776069663. The reversal of 776069640 is 46960677.

It is a super-2 number, since 2×776069640² = 1204568172259459200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43116 + ... + 58404.

It is an arithmetic number, because the mean of its divisors is an integer number (20641500).

Almost surely, 2^776069640 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 776069640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1321056000).

776069640 is an abundant number, since it is smaller than the sum of its proper divisors (1866042360).

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

776069640 is a wasteful number, since it uses less digits than its factorization.

776069640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15356 (or 15346 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 45.

The square root of 776069640 is about 27858.0264914800. The cubic root of 776069640 is about 918.9676668777.

The spelling of 776069640 in words is "seven hundred seventy-six million, sixty-nine thousand, six hundred forty".