2690666784 has 72 divisors (see below), whose sum is σ = 8240178492. Its totient is φ = 827896320.

The previous prime is 2690666773. The next prime is 2690666807. The reversal of 2690666784 is 4876660962.

It can be written as a sum of positive squares in 2 ways, for example, as 2398256784 + 292410000 = 48972^2 + 17100^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a self number, because there is not a number n which added to its sum of digits gives 2690666784.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 355587 + ... + 363074.

Almost surely, 2^2690666784 is an apocalyptic number.

2690666784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2690666784 is an abundant number, since it is smaller than the sum of its proper divisors (5549511708).

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

2690666784 is a wasteful number, since it uses less digits than its factorization.

2690666784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718690 (or 718679 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 54.

The square root of 2690666784 is about 51871.6375681354. The cubic root of 2690666784 is about 1390.8703180925.

The spelling of 2690666784 in words is "two billion, six hundred ninety million, six hundred sixty-six thousand, seven hundred eighty-four".