2649667440 has 80 divisors (see below), whose sum is σ = 9387399168. Its totient is φ = 605637888.

The previous prime is 2649667417. The next prime is 2649667451. The reversal of 2649667440 is 447669462.

It is a tau number, because it is divible by the number of its divisors (80).

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 2649667440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 786912 + ... + 790271.

Almost surely, 2^2649667440 is an apocalyptic number.

2649667440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2649667440 is an abundant number, since it is smaller than the sum of its proper divisors (6737731728).

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

2649667440 is a wasteful number, since it uses less digits than its factorization.

2649667440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1577206 (or 1577200 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 48.

The square root of 2649667440 is about 51474.9204953247. The cubic root of 2649667440 is about 1383.7696137165.

The spelling of 2649667440 in words is "two billion, six hundred forty-nine million, six hundred sixty-seven thousand, four hundred forty".