25709620 has 12 divisors (see below), whose sum is σ = 53990244. Its totient is φ = 10283840.

The previous prime is 25709617. The next prime is 25709623. The reversal of 25709620 is 2690752.

It is an interprime number because it is at equal distance from previous prime (25709617) and next prime (25709623).

It can be written as a sum of positive squares in 2 ways, for example, as 3825936 + 21883684 = 1956^2 + 4678^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25709623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 642721 + ... + 642760.

It is an arithmetic number, because the mean of its divisors is an integer number (4499187).

Almost surely, 2^25709620 is an apocalyptic number.

25709620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25709620 is an abundant number, since it is smaller than the sum of its proper divisors (28280624).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25709620 is a wasteful number, since it uses less digits than its factorization.

25709620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1285490 (or 1285488 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 25709620 is about 5070.4654618684. The cubic root of 25709620 is about 295.1425912211.

The spelling of 25709620 in words is "twenty-five million, seven hundred nine thousand, six hundred twenty".