2081570640 has 160 divisors (see below), whose sum is σ = 6716522496. Its totient is φ = 532707840.

The previous prime is 2081570611. The next prime is 2081570641. The reversal of 2081570640 is 460751802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2081570641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 943779 + ... + 945981.

Almost surely, 2^2081570640 is an apocalyptic number.

2081570640 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 2081570640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3358261248).

2081570640 is an abundant number, since it is smaller than the sum of its proper divisors (4634951856).

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

2081570640 is a wasteful number, since it uses less digits than its factorization.

2081570640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2377 (or 2371 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 2081570640 is about 45624.2330346495. The cubic root of 2081570640 is about 1276.8220807451.

The spelling of 2081570640 in words is "two billion, eighty-one million, five hundred seventy thousand, six hundred forty".