25697990 has 8 divisors (see below), whose sum is σ = 46256400. Its totient is φ = 10279192.

The previous prime is 25697983. The next prime is 25698037. The reversal of 25697990 is 9979652.

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

It is a super-4 number, since 4×25697990⁴ (a number of 31 digits) contains 4444 as substring.

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 3 ways as a sum of consecutive naturals, for example, 1284890 + ... + 1284909.

It is an arithmetic number, because the mean of its divisors is an integer number (5782050).

Almost surely, 2^25697990 is an apocalyptic number.

25697990 is a deficient number, since it is larger than the sum of its proper divisors (20558410).

25697990 is a wasteful number, since it uses less digits than its factorization.

25697990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2569806.

The product of its (nonzero) digits is 306180, while the sum is 47.

The square root of 25697990 is about 5069.3184946302. The cubic root of 25697990 is about 295.0980809555.

The spelling of 25697990 in words is "twenty-five million, six hundred ninety-seven thousand, nine hundred ninety".