2161620460 has 24 divisors (see below), whose sum is σ = 4594098096. Its totient is φ = 854230080.

The previous prime is 2161620457. The next prime is 2161620467. The reversal of 2161620460 is 640261612.

It is a super-2 number, since 2×2161620460² = 9345206026181223200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2161620467) 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 7 ways as a sum of consecutive naturals, for example, 649431 + ... + 652750.

It is an arithmetic number, because the mean of its divisors is an integer number (191420754).

Almost surely, 2^2161620460 is an apocalyptic number.

2161620460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2161620460 is an abundant number, since it is smaller than the sum of its proper divisors (2432477636).

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

2161620460 is a wasteful number, since it uses less digits than its factorization.

2161620460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1302273 (or 1302271 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 2161620460 is about 46493.2302598991. The cubic root of 2161620460 is about 1292.9839901821.

The spelling of 2161620460 in words is "two billion, one hundred sixty-one million, six hundred twenty thousand, four hundred sixty".