25616820 has 48 divisors (see below), whose sum is σ = 73402560. Its totient is φ = 6671616.

The previous prime is 25616813. The next prime is 25616849. The reversal of 25616820 is 2861652.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2385 + ... + 7544.

It is an arithmetic number, because the mean of its divisors is an integer number (1529220).

Almost surely, 2^25616820 is an apocalyptic number.

25616820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25616820 is an abundant number, since it is smaller than the sum of its proper divisors (47785740).

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

25616820 is a wasteful number, since it uses less digits than its factorization.

25616820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9984 (or 9982 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 25616820 is about 5061.3061555294. The cubic root of 25616820 is about 294.7870530617.

The spelling of 25616820 in words is "twenty-five million, six hundred sixteen thousand, eight hundred twenty".