2981897640 has 48 divisors (see below), whose sum is σ = 9691168500. Its totient is φ = 795172608.

The previous prime is 2981897627. The next prime is 2981897641. The reversal of 2981897640 is 467981892.

It can be written as a sum of positive squares in 2 ways, for example, as 2760661764 + 221235876 = 52542^2 + 14874^2 .

It is not an unprimeable number, because it can be changed into a prime (2981897641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4141165 + ... + 4141884.

Almost surely, 2^2981897640 is an apocalyptic number.

2981897640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2981897640 is an abundant number, since it is smaller than the sum of its proper divisors (6709270860).

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

2981897640 is a wasteful number, since it uses less digits than its factorization.

2981897640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8283066 (or 8283059 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The square root of 2981897640 is about 54606.7545272561. The cubic root of 2981897640 is about 1439.3428135451.

The spelling of 2981897640 in words is "two billion, nine hundred eighty-one million, eight hundred ninety-seven thousand, six hundred forty".