2075781640 has 16 divisors (see below), whose sum is σ = 4670508780. Its totient is φ = 830312640.

The previous prime is 2075781577. The next prime is 2075781641. The reversal of 2075781640 is 461875702.

It can be written as a sum of positive squares in 2 ways, for example, as 2031665476 + 44116164 = 45074^2 + 6642^2 .

It is a super-2 number, since 2×2075781640² = 8617738833922179200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 51894541 = 2075781640 / (2 + 0 + 7 + 5 + 7 + 8 + 1 + 6 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 2075781593 and 2075781602.

It is not an unprimeable number, because it can be changed into a prime (2075781641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25947231 + ... + 25947310.

Almost surely, 2^2075781640 is an apocalyptic number.

2075781640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2075781640 is an abundant number, since it is smaller than the sum of its proper divisors (2594727140).

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

2075781640 is a wasteful number, since it uses less digits than its factorization.

2075781640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51894552 (or 51894548 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 2075781640 is about 45560.7467015193. The cubic root of 2075781640 is about 1275.6373366211.

The spelling of 2075781640 in words is "two billion, seventy-five million, seven hundred eighty-one thousand, six hundred forty".