2640555420 has 24 divisors (see below), whose sum is σ = 7393555344. Its totient is φ = 704148096.

The previous prime is 2640555409. The next prime is 2640555433. The reversal of 2640555420 is 245550462.

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, 22004569 + ... + 22004688.

It is an arithmetic number, because the mean of its divisors is an integer number (308064806).

Almost surely, 2^2640555420 is an apocalyptic number.

2640555420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2640555420 is an abundant number, since it is smaller than the sum of its proper divisors (4752999924).

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

2640555420 is a wasteful number, since it uses less digits than its factorization.

2640555420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44009269 (or 44009267 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 33.

The square root of 2640555420 is about 51386.3349539544. The cubic root of 2640555420 is about 1382.1815631268.

The spelling of 2640555420 in words is "two billion, six hundred forty million, five hundred fifty-five thousand, four hundred twenty".