25621420 has 24 divisors (see below), whose sum is σ = 58696848. Its totient is φ = 9316800.

The previous prime is 25621417. The next prime is 25621423. The reversal of 25621420 is 2412652.

It is an interprime number because it is at equal distance from previous prime (25621417) and next prime (25621423).

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 = 25621391 and 25621400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25621423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58011 + ... + 58450.

It is an arithmetic number, because the mean of its divisors is an integer number (2445702).

Almost surely, 2^25621420 is an apocalyptic number.

25621420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25621420 is an abundant number, since it is smaller than the sum of its proper divisors (33075428).

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

25621420 is a wasteful number, since it uses less digits than its factorization.

25621420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116481 (or 116479 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 25621420 is about 5061.7605632823. The cubic root of 25621420 is about 294.8046969286.

The spelling of 25621420 in words is "twenty-five million, six hundred twenty-one thousand, four hundred twenty".