25629631 has 8 divisors (see below), whose sum is σ = 26068784. Its totient is φ = 25194240.

The previous prime is 25629623. The next prime is 25629673. The reversal of 25629631 is 13692652.

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

It is a 9-Lehmer number, since φ(25629631) divides (25629631-1)⁹.

It is a cyclic number.

It is not a de Polignac number, because 25629631 - 2³ = 25629623 is a prime.

It is a super-2 number, since 2×25629631² = 1313755970392322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25629601) 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, 15001 + ... + 16621.

It is an arithmetic number, because the mean of its divisors is an integer number (3258598).

Almost surely, 2^25629631 is an apocalyptic number.

25629631 is a deficient number, since it is larger than the sum of its proper divisors (439153).

25629631 is a wasteful number, since it uses less digits than its factorization.

25629631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1881.

The product of its digits is 19440, while the sum is 34.

The square root of 25629631 is about 5062.5715797409. The cubic root of 25629631 is about 294.8361859825.

The spelling of 25629631 in words is "twenty-five million, six hundred twenty-nine thousand, six hundred thirty-one".