7640635 has 4 divisors (see below), whose sum is σ = 9168768. Its totient is φ = 6112504.

The previous prime is 7640621. The next prime is 7640681. The reversal of 7640635 is 5360467.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5360467 = 7 ⋅765781.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7640635 is a prime.

It is a Smith number, since the sum of its digits (31) 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 junction number, because it is equal to n+sod(n) for n = 7640597 and 7640606.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 764059 + ... + 764068.

It is an arithmetic number, because the mean of its divisors is an integer number (2292192).

Almost surely, 2^7640635 is an apocalyptic number.

7640635 is a deficient number, since it is larger than the sum of its proper divisors (1528133).

7640635 is a wasteful number, since it uses less digits than its factorization.

7640635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1528132.

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 7640635 is about 2764.1698572989. The cubic root of 7640635 is about 196.9592965628.

The spelling of 7640635 in words is "seven million, six hundred forty thousand, six hundred thirty-five".