2123278164 has 96 divisors (see below), whose sum is σ = 6494208000. Its totient is φ = 587075040.

The previous prime is 2123278141. The next prime is 2123278169. The reversal of 2123278164 is 4618723212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123278169) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21864 + ... + 68735.

It is an arithmetic number, because the mean of its divisors is an integer number (67648000).

Almost surely, 2^2123278164 is an apocalyptic number.

It is an amenable number.

2123278164 is an abundant number, since it is smaller than the sum of its proper divisors (4370929836).

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

2123278164 is a wasteful number, since it uses less digits than its factorization.

2123278164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90650 (or 90642 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 2123278164 is about 46079.0425681784. The cubic root of 2123278164 is about 1285.2934603070.

The spelling of 2123278164 in words is "two billion, one hundred twenty-three million, two hundred seventy-eight thousand, one hundred sixty-four".