7825540 has 24 divisors (see below), whose sum is σ = 16493400. Its totient is φ = 3118848.

The previous prime is 7825529. The next prime is 7825553. The reversal of 7825540 is 455287.

It can be written as a sum of positive squares in 4 ways, for example, as 2359296 + 5466244 = 1536^2 + 2338^2 .

It is a super-2 number, since 2×7825540² = 122478152583200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6936 + ... + 7984.

It is an arithmetic number, because the mean of its divisors is an integer number (687225).

Almost surely, 2^7825540 is an apocalyptic number.

It is an amenable number.

7825540 is an abundant number, since it is smaller than the sum of its proper divisors (8667860).

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

7825540 is a wasteful number, since it uses less digits than its factorization.

7825540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1431 (or 1429 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 31.

The square root of 7825540 is about 2797.4166654254. The cubic root of 7825540 is about 198.5354685820.

The spelling of 7825540 in words is "seven million, eight hundred twenty-five thousand, five hundred forty".