25643442 has 32 divisors (see below), whose sum is σ = 57466944. Its totient is φ = 7560000.

The previous prime is 25643441. The next prime is 25643489. The reversal of 25643442 is 24434652.

It is a super-2 number, since 2×25643442² = 1315172235214728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25643441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2809 + ... + 7692.

It is an arithmetic number, because the mean of its divisors is an integer number (1795842).

Almost surely, 2^25643442 is an apocalyptic number.

25643442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

25643442 is an abundant number, since it is smaller than the sum of its proper divisors (31823502).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25643442 is a wasteful number, since it uses less digits than its factorization.

25643442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10554.

The product of its digits is 23040, while the sum is 30.

The square root of 25643442 is about 5063.9354261286. The cubic root of 25643442 is about 294.8891357807.

It can be divided in two parts, 2564 and 3442, that multiplied together give a palindrome (8825288).

The spelling of 25643442 in words is "twenty-five million, six hundred forty-three thousand, four hundred forty-two".