2128338725 has 12 divisors (see below), whose sum is σ = 2675294916. Its totient is φ = 1679345280.

The previous prime is 2128338677. The next prime is 2128338757. The reversal of 2128338725 is 5278338212.

It can be written as a sum of positive squares in 6 ways, for example, as 61999876 + 2066338849 = 7874^2 + 45457^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2128338725 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 581282 + ... + 584931.

It is an arithmetic number, because the mean of its divisors is an integer number (222941243).

Almost surely, 2^2128338725 is an apocalyptic number.

2128338725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2128338725 is a deficient number, since it is larger than the sum of its proper divisors (546956191).

2128338725 is a wasteful number, since it uses less digits than its factorization.

2128338725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1166296 (or 1166291 counting only the distinct ones).

The product of its digits is 161280, while the sum is 41.

The square root of 2128338725 is about 46133.9216304012. The cubic root of 2128338725 is about 1286.3137608196.

The spelling of 2128338725 in words is "two billion, one hundred twenty-eight million, three hundred thirty-eight thousand, seven hundred twenty-five".