25990380 has 144 divisors (see below), whose sum is σ = 88058880. Its totient is φ = 6160896.

The previous prime is 25990337. The next prime is 25990387. The reversal of 25990380 is 8309952.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (25990387) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 67669 + ... + 68051.

It is an arithmetic number, because the mean of its divisors is an integer number (611520).

Almost surely, 2^25990380 is an apocalyptic number.

25990380 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 25990380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44029440).

25990380 is an abundant number, since it is smaller than the sum of its proper divisors (62068500).

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

25990380 is a wasteful number, since it uses less digits than its factorization.

25990380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440 (or 435 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 25990380 is about 5098.0761077097. The cubic root of 25990380 is about 296.2130648820.

The spelling of 25990380 in words is "twenty-five million, nine hundred ninety thousand, three hundred eighty".