7640643 has 16 divisors (see below), whose sum is σ = 10449920. Its totient is φ = 4964544.

The previous prime is 7640621. The next prime is 7640681. The reversal of 7640643 is 3460467.

It is not a de Polignac number, because 7640643 - 2⁶ = 7640579 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7640643.

It is not an unprimeable number, because it can be changed into a prime (7640683) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 24255 + ... + 24567.

It is an arithmetic number, because the mean of its divisors is an integer number (653120).

Almost surely, 2^7640643 is an apocalyptic number.

7640643 is a deficient number, since it is larger than the sum of its proper divisors (2809277).

7640643 is a wasteful number, since it uses less digits than its factorization.

7640643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498.

The product of its (nonzero) digits is 12096, while the sum is 30.

The square root of 7640643 is about 2764.1713043876. The cubic root of 7640643 is about 196.9593653038.

The spelling of 7640643 in words is "seven million, six hundred forty thousand, six hundred forty-three".