25601620 has 24 divisors (see below), whose sum is σ = 58651488. Its totient is φ = 9309600.

The previous prime is 25601603. The next prime is 25601623. The reversal of 25601620 is 2610652.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 25601591 and 25601600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25601623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57966 + ... + 58405.

It is an arithmetic number, because the mean of its divisors is an integer number (2443812).

Almost surely, 2^25601620 is an apocalyptic number.

25601620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25601620 is an abundant number, since it is smaller than the sum of its proper divisors (33049868).

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

25601620 is a wasteful number, since it uses less digits than its factorization.

25601620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116391 (or 116389 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 25601620 is about 5059.8043440434. The cubic root of 25601620 is about 294.7287365633.

It can be divided in two parts, 256016 and 20, that added together give a square (256036 = 506²).

The spelling of 25601620 in words is "twenty-five million, six hundred one thousand, six hundred twenty".