2061640460 has 48 divisors (see below), whose sum is σ = 4747105440. Its totient is φ = 745866240.

The previous prime is 2061640447. The next prime is 2061640487. The reversal of 2061640460 is 640461602.

It is a super-2 number, since 2×2061640460² = 8500722772618023200, which contains 22 as substring.

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, 19556 + ... + 67124.

It is an arithmetic number, because the mean of its divisors is an integer number (98898030).

Almost surely, 2^2061640460 is an apocalyptic number.

2061640460 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 2061640460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2373552720).

2061640460 is an abundant number, since it is smaller than the sum of its proper divisors (2685464980).

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

2061640460 is a wasteful number, since it uses less digits than its factorization.

2061640460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47786 (or 47784 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 2061640460 is about 45405.2911013684. The cubic root of 2061640460 is about 1272.7339907283.

The spelling of 2061640460 in words is "two billion, sixty-one million, six hundred forty thousand, four hundred sixty".