25640319 has 8 divisors (see below), whose sum is σ = 34620160. Its totient is φ = 16877016.

The previous prime is 25640311. The next prime is 25640339. The reversal of 25640319 is 91304652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25640319 - 2³ = 25640311 is a prime.

It is a super-2 number, since 2×25640319² = 1314851916843522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25640311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53857 + ... + 54330.

It is an arithmetic number, because the mean of its divisors is an integer number (4327520).

Almost surely, 2^25640319 is an apocalyptic number.

25640319 is a deficient number, since it is larger than the sum of its proper divisors (8979841).

25640319 is a wasteful number, since it uses less digits than its factorization.

25640319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108269.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 25640319 is about 5063.6270597270. The cubic root of 25640319 is about 294.8771642188.

The spelling of 25640319 in words is "twenty-five million, six hundred forty thousand, three hundred nineteen".