25618640 has 40 divisors (see below), whose sum is σ = 59781888. Its totient is φ = 10209920.

The previous prime is 25618633. The next prime is 25618657. The reversal of 25618640 is 4681652.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 25618597 and 25618606.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 34109 + ... + 34851.

Almost surely, 2^25618640 is an apocalyptic number.

25618640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25618640 is an abundant number, since it is smaller than the sum of its proper divisors (34163248).

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

25618640 is a wasteful number, since it uses less digits than its factorization.

25618640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1187 (or 1181 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 25618640 is about 5061.4859478220. The cubic root of 25618640 is about 294.7940341485.

The spelling of 25618640 in words is "twenty-five million, six hundred eighteen thousand, six hundred forty".