2061871640 has 32 divisors (see below), whose sum is σ = 4883382000. Its totient is φ = 781340544.

The previous prime is 2061871631. The next prime is 2061871649. The reversal of 2061871640 is 461781602.

It is an interprime number because it is at equal distance from previous prime (2061871631) and next prime (2061871649).

It is a self number, because there is not a number n which added to its sum of digits gives 2061871640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2061871649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1355735 + ... + 1357254.

Almost surely, 2^2061871640 is an apocalyptic number.

2061871640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2061871640 is an abundant number, since it is smaller than the sum of its proper divisors (2821510360).

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

2061871640 is a wasteful number, since it uses less digits than its factorization.

2061871640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2713019 (or 2713015 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 2061871640 is about 45407.8367685579. The cubic root of 2061871640 is about 1272.7815612031.

The spelling of 2061871640 in words is "two billion, sixty-one million, eight hundred seventy-one thousand, six hundred forty".