2640426820 has 24 divisors (see below), whose sum is σ = 5553909144. Its totient is φ = 1054454016.

The previous prime is 2640426743. The next prime is 2640426839. The reversal of 2640426820 is 286240462.

2640426820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 323352324 + 2317074496 = 17982^2 + 48136^2 .

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, 94647 + ... + 119326.

It is an arithmetic number, because the mean of its divisors is an integer number (231412881).

Almost surely, 2^2640426820 is an apocalyptic number.

2640426820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2640426820 is an abundant number, since it is smaller than the sum of its proper divisors (2913482324).

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

2640426820 is a wasteful number, since it uses less digits than its factorization.

2640426820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214599 (or 214597 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 34.

The square root of 2640426820 is about 51385.0836332880. The cubic root of 2640426820 is about 1382.1591244847.

The spelling of 2640426820 in words is "two billion, six hundred forty million, four hundred twenty-six thousand, eight hundred twenty".