25430645 has 24 divisors (see below), whose sum is σ = 32817816. Its totient is φ = 18911232.

The previous prime is 25430641. The next prime is 25430659. The reversal of 25430645 is 54603452.

It can be written as a sum of positive squares in 4 ways, for example, as 1214404 + 24216241 = 1102^2 + 4921^2 .

It is not a de Polignac number, because 25430645 - 2² = 25430641 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 (25430641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 131669 + ... + 131861.

It is an arithmetic number, because the mean of its divisors is an integer number (1367409).

Almost surely, 2^25430645 is an apocalyptic number.

It is an amenable number.

25430645 is a deficient number, since it is larger than the sum of its proper divisors (7387171).

25430645 is a wasteful number, since it uses less digits than its factorization.

25430645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 290 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 29.

The square root of 25430645 is about 5042.8806251983. The cubic root of 25430645 is about 294.0711760971.

The spelling of 25430645 in words is "twenty-five million, four hundred thirty thousand, six hundred forty-five".