25428448369 has 3 divisors (see below), whose sum is σ = 25428607833. Its totient is φ = 25428288906.

The previous prime is 25428448361. The next prime is 25428448387. The reversal of 25428448369 is 96384482452.

The square root of 25428448369 is 159463.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 25428448369 - 2³ = 25428448361 is a prime.

It is a super-2 number, since 2×25428448369² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25428448361) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 79732 + ... + 239194.

It is an arithmetic number, because the mean of its divisors is an integer number (8476202611).

Almost surely, 2^25428448369 is an apocalyptic number.

25428448369 is the 159463-rd square number.

25428448369 is the 79732-nd centered octagonal number.

It is an amenable number.

25428448369 is a deficient number, since it is larger than the sum of its proper divisors (159464).

25428448369 is an frugal number, since it uses more digits than its factorization.

25428448369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318926 (or 159463 counting only the distinct ones).

The product of its digits is 13271040, while the sum is 55.

The spelling of 25428448369 in words is "twenty-five billion, four hundred twenty-eight million, four hundred forty-eight thousand, three hundred sixty-nine".