2780649864 has 64 divisors (see below), whose sum is σ = 7850688000. Its totient is φ = 911684160.

The previous prime is 2780649857. The next prime is 2780649869. The reversal of 2780649864 is 4689460872.

2780649864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 2780649864.

It is not an unprimeable number, because it can be changed into a prime (2780649869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92344 + ... + 118695.

It is an arithmetic number, because the mean of its divisors is an integer number (122667000).

Almost surely, 2^2780649864 is an apocalyptic number.

2780649864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2780649864 is an abundant number, since it is smaller than the sum of its proper divisors (5070038136).

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

2780649864 is a wasteful number, since it uses less digits than its factorization.

2780649864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211115 (or 211105 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 54.

The square root of 2780649864 is about 52731.8676323909. The cubic root of 2780649864 is about 1406.2054242226.

The spelling of 2780649864 in words is "two billion, seven hundred eighty million, six hundred forty-nine thousand, eight hundred sixty-four".