25749540 has 36 divisors (see below), whose sum is σ = 78107484. Its totient is φ = 6866496.

The previous prime is 25749539. The next prime is 25749551. The reversal of 25749540 is 4594752.

It can be written as a sum of positive squares in 2 ways, for example, as 19873764 + 5875776 = 4458^2 + 2424^2 .

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 (36).

It is a junction number, because it is equal to n+sod(n) for n = 25749495 and 25749504.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71347 + ... + 71706.

Almost surely, 2^25749540 is an apocalyptic number.

25749540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25749540 is an abundant number, since it is smaller than the sum of its proper divisors (52357944).

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

25749540 is a wasteful number, since it uses less digits than its factorization.

25749540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143068 (or 143063 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 25749540 is about 5074.4004571969. The cubic root of 25749540 is about 295.2952707677.

The spelling of 25749540 in words is "twenty-five million, seven hundred forty-nine thousand, five hundred forty".