2145578974 has 48 divisors (see below), whose sum is σ = 4090005360. Its totient is φ = 834744960.

The previous prime is 2145578947. The next prime is 2145578983. The reversal of 2145578974 is 4798755412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1332682 + ... + 1334290.

It is an arithmetic number, because the mean of its divisors is an integer number (85208445).

Almost surely, 2^2145578974 is an apocalyptic number.

2145578974 is a deficient number, since it is larger than the sum of its proper divisors (1944426386).

2145578974 is a wasteful number, since it uses less digits than its factorization.

2145578974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2873 (or 2866 counting only the distinct ones).

The product of its digits is 2822400, while the sum is 52.

The square root of 2145578974 is about 46320.3947953814. The cubic root of 2145578974 is about 1289.7776140493. Note that the first 3 decimals are identical.

The spelling of 2145578974 in words is "two billion, one hundred forty-five million, five hundred seventy-eight thousand, nine hundred seventy-four".