2061640840 has 32 divisors (see below), whose sum is σ = 5301362880. Its totient is φ = 706848192.

The previous prime is 2061640831. The next prime is 2061640859. The reversal of 2061640840 is 480461602.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3681222 + ... + 3681781.

It is an arithmetic number, because the mean of its divisors is an integer number (165667590).

Almost surely, 2^2061640840 is an apocalyptic number.

2061640840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2061640840 is an abundant number, since it is smaller than the sum of its proper divisors (3239722040).

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

2061640840 is a wasteful number, since it uses less digits than its factorization.

2061640840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7363021 (or 7363017 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 2061640840 is about 45405.2952859025. The cubic root of 2061640840 is about 1272.7340689247.

The spelling of 2061640840 in words is "two billion, sixty-one million, six hundred forty thousand, eight hundred forty".