25640633 has 16 divisors (see below), whose sum is σ = 27864000. Its totient is φ = 23519232.

The previous prime is 25640617. The next prime is 25640639. The reversal of 25640633 is 33604652.

It is a cyclic number.

It is not a de Polignac number, because 25640633 - 2⁴ = 25640617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25640596 and 25640605.

It is not an unprimeable number, because it can be changed into a prime (25640639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99641 + ... + 99897.

It is an arithmetic number, because the mean of its divisors is an integer number (1741500).

Almost surely, 2^25640633 is an apocalyptic number.

It is an amenable number.

25640633 is a deficient number, since it is larger than the sum of its proper divisors (2223367).

25640633 is a wasteful number, since it uses less digits than its factorization.

25640633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424.

The product of its (nonzero) digits is 12960, while the sum is 29.

The square root of 25640633 is about 5063.6580650751. The cubic root of 25640633 is about 294.8783679356.

The spelling of 25640633 in words is "twenty-five million, six hundred forty thousand, six hundred thirty-three".