7425640 has 16 divisors (see below), whose sum is σ = 16707780. Its totient is φ = 2970240.

The previous prime is 7425631. The next prime is 7425661. The reversal of 7425640 is 465247.

It can be written as a sum of positive squares in 2 ways, for example, as 7043716 + 381924 = 2654^2 + 618^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7425599 and 7425608.

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 3 ways as a sum of consecutive naturals, for example, 92781 + ... + 92860.

Almost surely, 2^7425640 is an apocalyptic number.

It is an amenable number.

7425640 is an abundant number, since it is smaller than the sum of its proper divisors (9282140).

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

7425640 is a wasteful number, since it uses less digits than its factorization.

7425640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185652 (or 185648 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 7425640 is about 2725.0027522922. The cubic root of 7425640 is about 195.0943221093.

The spelling of 7425640 in words is "seven million, four hundred twenty-five thousand, six hundred forty".