25699420 has 12 divisors (see below), whose sum is σ = 53968824. Its totient is φ = 10279760.

The previous prime is 25699379. The next prime is 25699439. The reversal of 25699420 is 2499652.

It is a self number, because there is not a number n which added to its sum of digits gives 25699420.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 642466 + ... + 642505.

It is an arithmetic number, because the mean of its divisors is an integer number (4497402).

Almost surely, 2^25699420 is an apocalyptic number.

25699420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25699420 is an abundant number, since it is smaller than the sum of its proper divisors (28269404).

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

25699420 is a wasteful number, since it uses less digits than its factorization.

25699420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1284980 (or 1284978 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 25699420 is about 5069.4595372682. The cubic root of 25699420 is about 295.1035545669.

The spelling of 25699420 in words is "twenty-five million, six hundred ninety-nine thousand, four hundred twenty".