2646787440 has 160 divisors (see below), whose sum is σ = 9239980032. Its totient is φ = 620928000.

The previous prime is 2646787433. The next prime is 2646787441. The reversal of 2646787440 is 447876462.

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 2646787440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2646787441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65670 + ... + 98010.

Almost surely, 2^2646787440 is an apocalyptic number.

2646787440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2646787440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4619990016).

2646787440 is an abundant number, since it is smaller than the sum of its proper divisors (6593192592).

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

2646787440 is a wasteful number, since it uses less digits than its factorization.

2646787440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32399 (or 32393 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 48.

The square root of 2646787440 is about 51446.9381013098. The cubic root of 2646787440 is about 1383.2680789206.

The spelling of 2646787440 in words is "two billion, six hundred forty-six million, seven hundred eighty-seven thousand, four hundred forty".