25628749 has 4 divisors (see below), whose sum is σ = 25646560. Its totient is φ = 25610940.

The previous prime is 25628737. The next prime is 25628761. The reversal of 25628749 is 94782652.

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.

It is an interprime number because it is at equal distance from previous prime (25628737) and next prime (25628761).

It is a cyclic number.

It is not a de Polignac number, because 25628749 - 2⁵ = 25628717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25628719) 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, 6537 + ... + 9694.

It is an arithmetic number, because the mean of its divisors is an integer number (6411640).

Almost surely, 2^25628749 is an apocalyptic number.

It is an amenable number.

25628749 is a deficient number, since it is larger than the sum of its proper divisors (17811).

25628749 is a wasteful number, since it uses less digits than its factorization.

25628749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17810.

The product of its digits is 241920, while the sum is 43.

The square root of 25628749 is about 5062.4844691120. The cubic root of 25628749 is about 294.8328038491.

It can be divided in two parts, 2562 and 8749, that added together give a palindrome (11311).

The spelling of 25628749 in words is "twenty-five million, six hundred twenty-eight thousand, seven hundred forty-nine".