7639006891 has 4 divisors (see below), whose sum is σ = 7647023592. Its totient is φ = 7630990192.

The previous prime is 7639006883. The next prime is 7639006897. The reversal of 7639006891 is 1986009367.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7639006891 - 2³ = 7639006883 is a prime.

It is a Smith number, since the sum of its digits (49) 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 not an unprimeable number, because it can be changed into a prime (7639006897) 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, 4006921 + ... + 4008826.

It is an arithmetic number, because the mean of its divisors is an integer number (1911755898).

Almost surely, 2^7639006891 is an apocalyptic number.

7639006891 is a deficient number, since it is larger than the sum of its proper divisors (8016701).

7639006891 is an equidigital number, since it uses as much as digits as its factorization.

7639006891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8016700.

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 7639006891 is about 87401.4124084960. The cubic root of 7639006891 is about 1969.4530584157.

The spelling of 7639006891 in words is "seven billion, six hundred thirty-nine million, six thousand, eight hundred ninety-one".