25778431 has 8 divisors (see below), whose sum is σ = 29615264. Its totient is φ = 21980160.

The previous prime is 25778413. The next prime is 25778449. The reversal of 25778431 is 13487752.

It is an interprime number because it is at equal distance from previous prime (25778413) and next prime (25778449).

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

It is a cyclic number.

It is not a de Polignac number, because 25778431 - 2⁵ = 25778399 is a prime.

It is a super-2 number, since 2×25778431² = 1329055009643522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25778461) 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, 8190 + ... + 10891.

It is an arithmetic number, because the mean of its divisors is an integer number (3701908).

Almost surely, 2^25778431 is an apocalyptic number.

25778431 is a deficient number, since it is larger than the sum of its proper divisors (3836833).

25778431 is a wasteful number, since it uses less digits than its factorization.

25778431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19281.

The product of its digits is 47040, while the sum is 37.

The square root of 25778431 is about 5077.2463993783. The cubic root of 25778431 is about 295.4056699816.

The spelling of 25778431 in words is "twenty-five million, seven hundred seventy-eight thousand, four hundred thirty-one".