2191620460 has 12 divisors (see below), whose sum is σ = 4602403008. Its totient is φ = 876648176.

The previous prime is 2191620443. The next prime is 2191620463. The reversal of 2191620460 is 640261912.

It is a super-2 number, since 2×2191620460² = 9606400481381223200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2191620463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54790492 + ... + 54790531.

It is an arithmetic number, because the mean of its divisors is an integer number (383533584).

Almost surely, 2^2191620460 is an apocalyptic number.

2191620460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2191620460 is an abundant number, since it is smaller than the sum of its proper divisors (2410782548).

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

2191620460 is a wasteful number, since it uses less digits than its factorization.

2191620460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109581032 (or 109581030 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 2191620460 is about 46814.7461810913. The cubic root of 2191620460 is about 1298.9380795394.

The spelling of 2191620460 in words is "two billion, one hundred ninety-one million, six hundred twenty thousand, four hundred sixty".