2161378272 has 24 divisors (see below), whose sum is σ = 5673618216. Its totient is φ = 720459392.

The previous prime is 2161378253. The next prime is 2161378309. The reversal of 2161378272 is 2728731612.

It is a tau number, because it is divible by the number of its divisors (24).

It is a self number, because there is not a number n which added to its sum of digits gives 2161378272.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11257083 + ... + 11257274.

It is an arithmetic number, because the mean of its divisors is an integer number (236400759).

Almost surely, 2^2161378272 is an apocalyptic number.

It is an amenable number.

2161378272 is an abundant number, since it is smaller than the sum of its proper divisors (3512239944).

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

2161378272 is a wasteful number, since it uses less digits than its factorization.

2161378272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22514370 (or 22514362 counting only the distinct ones).

The product of its digits is 56448, while the sum is 39.

The square root of 2161378272 is about 46490.6256357128. The cubic root of 2161378272 is about 1292.9356997278.

The spelling of 2161378272 in words is "two billion, one hundred sixty-one million, three hundred seventy-eight thousand, two hundred seventy-two".