25817490 has 48 divisors (see below), whose sum is σ = 68948568. Its totient is φ = 6697728.

The previous prime is 25817483. The next prime is 25817503. The reversal of 25817490 is 9471852.

25817490 is a `hidden beast` number, since 2 + 581 + 74 + 9 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 25431849 + 385641 = 5043^2 + 621^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 547 + ... + 7206.

Almost surely, 2^25817490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25817490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34474284).

25817490 is an abundant number, since it is smaller than the sum of its proper divisors (43131078).

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

25817490 is a wasteful number, since it uses less digits than its factorization.

25817490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7803 (or 7800 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 25817490 is about 5081.0914181896. The cubic root of 25817490 is about 295.5547924198.

The spelling of 25817490 in words is "twenty-five million, eight hundred seventeen thousand, four hundred ninety".