25535640 has 64 divisors (see below), whose sum is σ = 82504800. Its totient is φ = 6285312.

The previous prime is 25535633. The next prime is 25535641. The reversal of 25535640 is 4653552.

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 = 25535598 and 25535607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25535641) 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, 6625 + ... + 9744.

Almost surely, 2^25535640 is an apocalyptic number.

25535640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25535640 is an abundant number, since it is smaller than the sum of its proper divisors (56969160).

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

25535640 is a wasteful number, since it uses less digits than its factorization.

25535640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16396 (or 16392 counting only the distinct ones).

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

The square root of 25535640 is about 5053.2801228509. The cubic root of 25535640 is about 294.4753290125.

The spelling of 25535640 in words is "twenty-five million, five hundred thirty-five thousand, six hundred forty".