2809145972 has 24 divisors (see below), whose sum is σ = 5341674240. Its totient is φ = 1287722880.

The previous prime is 2809145971. The next prime is 2809145993. The reversal of 2809145972 is 2795419082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2809145971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 593813 + ... + 598524.

It is an arithmetic number, because the mean of its divisors is an integer number (222569760).

Almost surely, 2^2809145972 is an apocalyptic number.

It is an amenable number.

2809145972 is a deficient number, since it is larger than the sum of its proper divisors (2532528268).

2809145972 is a wasteful number, since it uses less digits than its factorization.

2809145972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1192391 (or 1192389 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 47.

The square root of 2809145972 is about 53001.3770764496. The cubic root of 2809145972 is about 1410.9927070227.

The spelling of 2809145972 in words is "two billion, eight hundred nine million, one hundred forty-five thousand, nine hundred seventy-two".