25861720 has 16 divisors (see below), whose sum is σ = 58188960. Its totient is φ = 10344672.

The previous prime is 25861699. The next prime is 25861723. The reversal of 25861720 is 2716852.

It is a super-2 number, since 2×25861720² = 1337657122716800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25861723) 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, 323232 + ... + 323311.

It is an arithmetic number, because the mean of its divisors is an integer number (3636810).

Almost surely, 2^25861720 is an apocalyptic number.

25861720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25861720 is an abundant number, since it is smaller than the sum of its proper divisors (32327240).

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

25861720 is a wasteful number, since it uses less digits than its factorization.

25861720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646554 (or 646550 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 25861720 is about 5085.4419670271. The cubic root of 25861720 is about 295.7234756193.

The spelling of 25861720 in words is "twenty-five million, eight hundred sixty-one thousand, seven hundred twenty".