25707864 has 128 divisors (see below), whose sum is σ = 80640000. Its totient is φ = 6649344.

The previous prime is 25707863. The next prime is 25707881. The reversal of 25707864 is 46870752.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25707863) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 172462 + ... + 172610.

It is an arithmetic number, because the mean of its divisors is an integer number (630000).

Almost surely, 2^25707864 is an apocalyptic number.

25707864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25707864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40320000).

25707864 is an abundant number, since it is smaller than the sum of its proper divisors (54932136).

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

25707864 is a wasteful number, since it uses less digits than its factorization.

25707864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257 (or 253 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 39.

The square root of 25707864 is about 5070.2922992664. The cubic root of 25707864 is about 295.1358715290.

The spelling of 25707864 in words is "twenty-five million, seven hundred seven thousand, eight hundred sixty-four".