25784628349 has 4 divisors (see below), whose sum is σ = 25784955136. Its totient is φ = 25784301564.

The previous prime is 25784628347. The next prime is 25784628371. The reversal of 25784628349 is 94382648752.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25784628349 - 2¹ = 25784628347 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25784628293 and 25784628302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25784628343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36382 + ... + 229984.

It is an arithmetic number, because the mean of its divisors is an integer number (6446238784).

Almost surely, 2^25784628349 is an apocalyptic number.

It is an amenable number.

25784628349 is a deficient number, since it is larger than the sum of its proper divisors (326787).

25784628349 is a wasteful number, since it uses less digits than its factorization.

25784628349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326786.

The product of its digits is 23224320, while the sum is 58.

The spelling of 25784628349 in words is "twenty-five billion, seven hundred eighty-four million, six hundred twenty-eight thousand, three hundred forty-nine".