25447680 has 162 divisors, whose sum is σ = 89959506. Its totient is φ = 6641664.

The previous prime is 25447673. The next prime is 25447711. The reversal of 25447680 is 8674452.

It can be written as a sum of positive squares in only one way, i.e., 20358144 + 5089536 = 4512^2 + 2256^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 541417 + ... + 541463.

Almost surely, 2^25447680 is an apocalyptic number.

25447680 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 25447680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44979753).

25447680 is an abundant number, since it is smaller than the sum of its proper divisors (64511826).

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

25447680 is an equidigital number, since it uses as much as digits as its factorization.

25447680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121 (or 57 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 25447680 is about 5044.5693572395. The cubic root of 25447680 is about 294.1368237222.

The spelling of 25447680 in words is "twenty-five million, four hundred forty-seven thousand, six hundred eighty".