25693840 has 40 divisors (see below), whose sum is σ = 59962680. Its totient is φ = 10238976.

The previous prime is 25693813. The next prime is 25693847. The reversal of 25693840 is 4839652.

It can be written as a sum of positive squares in 4 ways, for example, as 8785296 + 16908544 = 2964^2 + 4112^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 25693840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25693847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31356 + ... + 32164.

It is an arithmetic number, because the mean of its divisors is an integer number (1499067).

Almost surely, 2^25693840 is an apocalyptic number.

25693840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25693840 is an abundant number, since it is smaller than the sum of its proper divisors (34268840).

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

25693840 is a wasteful number, since it uses less digits than its factorization.

25693840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1219 (or 1213 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 25693840 is about 5068.9091528651. The cubic root of 25693840 is about 295.0821948497.

The spelling of 25693840 in words is "twenty-five million, six hundred ninety-three thousand, eight hundred forty".