2561214428 has 18 divisors (see below), whose sum is σ = 4578730128. Its totient is φ = 1253020680.

The previous prime is 2561214419. The next prime is 2561214553. The reversal of 2561214428 is 8244121652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 692063 + ... + 695753.

It is an arithmetic number, because the mean of its divisors is an integer number (254373896).

Almost surely, 2^2561214428 is an apocalyptic number.

It is an amenable number.

2561214428 is a deficient number, since it is larger than the sum of its proper divisors (2017515700).

2561214428 is an frugal number, since it uses more digits than its factorization.

2561214428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7433 (or 3740 counting only the distinct ones).

The product of its digits is 30720, while the sum is 35.

The square root of 2561214428 is about 50608.4422601605. The cubic root of 2561214428 is about 1368.1970400891.

The spelling of 2561214428 in words is "two billion, five hundred sixty-one million, two hundred fourteen thousand, four hundred twenty-eight".