2776646640 has 40 divisors (see below), whose sum is σ = 8607605328. Its totient is φ = 740439040.

The previous prime is 2776646633. The next prime is 2776646723. The reversal of 2776646640 is 466466772.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 2776646640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5784441 + ... + 5784920.

Almost surely, 2^2776646640 is an apocalyptic number.

2776646640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2776646640 is an abundant number, since it is smaller than the sum of its proper divisors (5830958688).

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

2776646640 is a wasteful number, since it uses less digits than its factorization.

2776646640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11569377 (or 11569371 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 48.

The square root of 2776646640 is about 52693.8956616419. The cubic root of 2776646640 is about 1405.5302752207.

The spelling of 2776646640 in words is "two billion, seven hundred seventy-six million, six hundred forty-six thousand, six hundred forty".