25619920 has 40 divisors (see below), whose sum is σ = 59824296. Its totient is φ = 10203648.

The previous prime is 25619917. The next prime is 25619921. The reversal of 25619920 is 2991652.

It can be written as a sum of positive squares in 4 ways, for example, as 16451136 + 9168784 = 4056^2 + 3028^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25619921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22894 + ... + 23986.

Almost surely, 2^25619920 is an apocalyptic number.

25619920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25619920 is an abundant number, since it is smaller than the sum of its proper divisors (34204376).

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

25619920 is a wasteful number, since it uses less digits than its factorization.

25619920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1399 (or 1393 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 25619920 is about 5061.6123913235. The cubic root of 25619920 is about 294.7989437258.

The spelling of 25619920 in words is "twenty-five million, six hundred nineteen thousand, nine hundred twenty".