25064639 has 2 divisors, whose sum is σ = 25064640. Its totient is φ = 25064638.

The previous prime is 25064617. The next prime is 25064693. The reversal of 25064639 is 93646052.

Together with next prime (25064693) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25064639 - 2⁸ = 25064383 is a prime.

It is a super-2 number, since 2×25064639² = 1256472256400642, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 25064599 and 25064608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25064939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12532319 + 12532320.

It is an arithmetic number, because the mean of its divisors is an integer number (12532320).

Almost surely, 2^25064639 is an apocalyptic number.

25064639 is a deficient number, since it is larger than the sum of its proper divisors (1).

25064639 is an equidigital number, since it uses as much as digits as its factorization.

25064639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 25064639 is about 5006.4597271925. The cubic root of 25064639 is about 292.6535643827.

The spelling of 25064639 in words is "twenty-five million, sixty-four thousand, six hundred thirty-nine".