25680740 has 12 divisors (see below), whose sum is σ = 53929596. Its totient is φ = 10272288.

The previous prime is 25680731. The next prime is 25680757. The reversal of 25680740 is 4708652.

It can be written as a sum of positive squares in 2 ways, for example, as 9872164 + 15808576 = 3142^2 + 3976^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 25680697 and 25680706.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 641999 + ... + 642038.

It is an arithmetic number, because the mean of its divisors is an integer number (4494133).

Almost surely, 2^25680740 is an apocalyptic number.

25680740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25680740 is an abundant number, since it is smaller than the sum of its proper divisors (28248856).

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

25680740 is a wasteful number, since it uses less digits than its factorization.

25680740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1284046 (or 1284044 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 25680740 is about 5067.6167968780. The cubic root of 25680740 is about 295.0320371220.

The spelling of 25680740 in words is "twenty-five million, six hundred eighty thousand, seven hundred forty".