25717540 has 12 divisors (see below), whose sum is σ = 54006876. Its totient is φ = 10287008.

The previous prime is 25717487. The next prime is 25717541. The reversal of 25717540 is 4571752.

It can be written as a sum of positive squares in 2 ways, for example, as 18524416 + 7193124 = 4304^2 + 2682^2 .

It is a super-2 number, since 2×25717540² = 1322783727303200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25717541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 642919 + ... + 642958.

It is an arithmetic number, because the mean of its divisors is an integer number (4500573).

Almost surely, 2^25717540 is an apocalyptic number.

25717540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25717540 is an abundant number, since it is smaller than the sum of its proper divisors (28289336).

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

25717540 is a wasteful number, since it uses less digits than its factorization.

25717540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285886 (or 1285884 counting only the distinct ones).

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 25717540 is about 5071.2463951183. The cubic root of 25717540 is about 295.1728949146.

The spelling of 25717540 in words is "twenty-five million, seven hundred seventeen thousand, five hundred forty".