25643404 has 6 divisors (see below), whose sum is σ = 44875964. Its totient is φ = 12821700.

The previous prime is 25643389. The next prime is 25643419. The reversal of 25643404 is 40434652.

It is an interprime number because it is at equal distance from previous prime (25643389) and next prime (25643419).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3205422 + ... + 3205429.

Almost surely, 2^25643404 is an apocalyptic number.

It is an amenable number.

25643404 is a deficient number, since it is larger than the sum of its proper divisors (19232560).

25643404 is a wasteful number, since it uses less digits than its factorization.

25643404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6410855 (or 6410853 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

The square root of 25643404 is about 5063.9316741046. The cubic root of 25643404 is about 294.8889901191. Note that the first 3 decimals are identical.

It can be divided in two parts, 256 and 43404, that added together give a triangular number (43660 = T₂₉₅).

The spelling of 25643404 in words is "twenty-five million, six hundred forty-three thousand, four hundred four".