25579980 has 36 divisors (see below), whose sum is σ = 77593152. Its totient is φ = 6821280.

The previous prime is 25579927. The next prime is 25579993. The reversal of 25579980 is 8997552.

It is a happy number.

25579980 is a `hidden beast` number, since 2 + 557 + 9 + 98 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 70876 + ... + 71235.

Almost surely, 2^25579980 is an apocalyptic number.

25579980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25579980 is an abundant number, since it is smaller than the sum of its proper divisors (52013172).

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

25579980 is a wasteful number, since it uses less digits than its factorization.

25579980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142126 (or 142121 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 45.

The square root of 25579980 is about 5057.6654693643. The cubic root of 25579980 is about 294.6456724485.

The spelling of 25579980 in words is "twenty-five million, five hundred seventy-nine thousand, nine hundred eighty".