2081958640 has 40 divisors (see below), whose sum is σ = 4844073888. Its totient is φ = 832177920.

The previous prime is 2081958623. The next prime is 2081958647. The reversal of 2081958640 is 468591802.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2081958647) 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, 110725 + ... + 128155.

Almost surely, 2^2081958640 is an apocalyptic number.

2081958640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2081958640 is an abundant number, since it is smaller than the sum of its proper divisors (2762115248).

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

2081958640 is a wasteful number, since it uses less digits than its factorization.

2081958640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18937 (or 18931 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 2081958640 is about 45628.4849627949. The cubic root of 2081958640 is about 1276.9014080537.

The spelling of 2081958640 in words is "two billion, eighty-one million, nine hundred fifty-eight thousand, six hundred forty".