2291163640 has 64 divisors (see below), whose sum is σ = 5558868000. Its totient is φ = 847042560.

The previous prime is 2291163629. The next prime is 2291163683. The reversal of 2291163640 is 463611922.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2291163596 and 2291163605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5605 + ... + 67924.

Almost surely, 2^2291163640 is an apocalyptic number.

2291163640 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 2291163640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2779434000).

2291163640 is an abundant number, since it is smaller than the sum of its proper divisors (3267704360).

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

2291163640 is a wasteful number, since it uses less digits than its factorization.

2291163640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73600 (or 73596 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 2291163640 is about 47866.1011572908. The cubic root of 2291163640 is about 1318.3135104029.

The spelling of 2291163640 in words is "two billion, two hundred ninety-one million, one hundred sixty-three thousand, six hundred forty".