7640863 has 4 divisors (see below), whose sum is σ = 7647640. Its totient is φ = 7634088.

The previous prime is 7640861. The next prime is 7640873. The reversal of 7640863 is 3680467.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3680467 = 7 ⋅525781.

It is a cyclic number.

It is not a de Polignac number, because 7640863 - 2¹ = 7640861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7640861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1245 + ... + 4102.

It is an arithmetic number, because the mean of its divisors is an integer number (1911910).

Almost surely, 2^7640863 is an apocalyptic number.

7640863 is a deficient number, since it is larger than the sum of its proper divisors (6777).

7640863 is a wasteful number, since it uses less digits than its factorization.

7640863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6776.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 7640863 is about 2764.2110990299. The cubic root of 7640863 is about 196.9612556614.

The spelling of 7640863 in words is "seven million, six hundred forty thousand, eight hundred sixty-three".