7913640 has 64 divisors (see below), whose sum is σ = 27135360. Its totient is φ = 1808640.

The previous prime is 7913627. The next prime is 7913657. The reversal of 7913640 is 463197.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 7913598 and 7913607.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3871 + ... + 5550.

It is an arithmetic number, because the mean of its divisors is an integer number (423990).

Almost surely, 2^7913640 is an apocalyptic number.

7913640 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

7913640 is an abundant number, since it is smaller than the sum of its proper divisors (19221720).

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

7913640 is a wasteful number, since it uses less digits than its factorization.

7913640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9442 (or 9438 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 7913640 is about 2813.1192651575. The cubic root of 7913640 is about 199.2777280897.

The spelling of 7913640 in words is "seven million, nine hundred thirteen thousand, six hundred forty".