6540725 has 12 divisors (see below), whose sum is σ = 8245380. Its totient is φ = 5145600.

The previous prime is 6540719. The next prime is 6540739. The reversal of 6540725 is 5270456.

It can be written as a sum of positive squares in 6 ways, for example, as 195364 + 6345361 = 442^2 + 2519^2 .

It is not a de Polignac number, because 6540725 - 2¹⁸ = 6278581 is a prime.

It is a congruent number.

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, 620 + ... + 3669.

It is an arithmetic number, because the mean of its divisors is an integer number (687115).

Almost surely, 2^6540725 is an apocalyptic number.

It is an amenable number.

6540725 is a deficient number, since it is larger than the sum of its proper divisors (1704655).

6540725 is a wasteful number, since it uses less digits than its factorization.

6540725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4360 (or 4355 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 6540725 is about 2557.4841152977. The cubic root of 6540725 is about 187.0145069627.

The spelling of 6540725 in words is "six million, five hundred forty thousand, seven hundred twenty-five".