25355640 has 32 divisors (see below), whose sum is σ = 76067280. Its totient is φ = 6761472.

The previous prime is 25355639. The next prime is 25355641. The reversal of 25355640 is 4655352.

It is an interprime number because it is at equal distance from previous prime (25355639) and next prime (25355641).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 25355598 and 25355607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25355641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105529 + ... + 105768.

Almost surely, 2^25355640 is an apocalyptic number.

25355640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25355640 is an abundant number, since it is smaller than the sum of its proper divisors (50711640).

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

25355640 is a wasteful number, since it uses less digits than its factorization.

25355640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211311 (or 211307 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 30.

The square root of 25355640 is about 5035.4384118962. The cubic root of 25355640 is about 293.7817807776.

The spelling of 25355640 in words is "twenty-five million, three hundred fifty-five thousand, six hundred forty".