25243690 has 8 divisors (see below), whose sum is σ = 45438660. Its totient is φ = 10097472.

The previous prime is 25243667. The next prime is 25243697. The reversal of 25243690 is 9634252.

It can be written as a sum of positive squares in 2 ways, for example, as 21335161 + 3908529 = 4619^2 + 1977^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×25243690² = 1274487769632200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25243697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1262175 + ... + 1262194.

Almost surely, 2^25243690 is an apocalyptic number.

25243690 is a deficient number, since it is larger than the sum of its proper divisors (20194970).

25243690 is a wasteful number, since it uses less digits than its factorization.

25243690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2524376.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 25243690 is about 5024.3099028623. The cubic root of 25243690 is about 293.3487753005.

The spelling of 25243690 in words is "twenty-five million, two hundred forty-three thousand, six hundred ninety".