25605720 has 160 divisors (see below), whose sum is σ = 98445600. Its totient is φ = 5847552.

The previous prime is 25605719. The next prime is 25605733. The reversal of 25605720 is 2750652.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 22116 + ... + 23244.

It is an arithmetic number, because the mean of its divisors is an integer number (615285).

Almost surely, 2^25605720 is an apocalyptic number.

25605720 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 25605720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49222800).

25605720 is an abundant number, since it is smaller than the sum of its proper divisors (72839880).

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

25605720 is a wasteful number, since it uses less digits than its factorization.

25605720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1159 (or 1146 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 25605720 is about 5060.2094818298. The cubic root of 25605720 is about 294.7444689442.

The spelling of 25605720 in words is "twenty-five million, six hundred five thousand, seven hundred twenty".