25431864 has 64 divisors (see below), whose sum is σ = 68221440. Its totient is φ = 7872000.

The previous prime is 25431863. The next prime is 25431911. The reversal of 25431864 is 46813452.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25431863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33489 + ... + 34239.

It is an arithmetic number, because the mean of its divisors is an integer number (1065960).

Almost surely, 2^25431864 is an apocalyptic number.

25431864 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 25431864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34110720).

25431864 is an abundant number, since it is smaller than the sum of its proper divisors (42789576).

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

25431864 is a wasteful number, since it uses less digits than its factorization.

25431864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860 (or 856 counting only the distinct ones).

The product of its digits is 23040, while the sum is 33.

The square root of 25431864 is about 5043.0014872098. The cubic root of 25431864 is about 294.0758747201.

The spelling of 25431864 in words is "twenty-five million, four hundred thirty-one thousand, eight hundred sixty-four".