25597040 has 80 divisors (see below), whose sum is σ = 69662208. Its totient is φ = 8563968.

The previous prime is 25597037. The next prime is 25597049. The reversal of 25597040 is 4079552.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 25596988 and 25597006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25597049) 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, 23549 + ... + 24611.

Almost surely, 2^25597040 is an apocalyptic number.

25597040 is a gapful number since it is divisible by the number (20) 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 25597040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34831104).

25597040 is an abundant number, since it is smaller than the sum of its proper divisors (44065168).

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

25597040 is a wasteful number, since it uses less digits than its factorization.

25597040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1126 (or 1120 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 25597040 is about 5059.3517371300. The cubic root of 25597040 is about 294.7111603563.

The spelling of 25597040 in words is "twenty-five million, five hundred ninety-seven thousand, forty".