7638422977 has 4 divisors (see below), whose sum is σ = 7638857136. Its totient is φ = 7637988820.

The previous prime is 7638422947. The next prime is 7638423007. The reversal of 7638422977 is 7792248367.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (7638422947) and next prime (7638423007).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7638422977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7638422927) 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, 189523 + ... + 226264.

It is an arithmetic number, because the mean of its divisors is an integer number (1909714284).

Almost surely, 2^7638422977 is an apocalyptic number.

It is an amenable number.

7638422977 is a deficient number, since it is larger than the sum of its proper divisors (434159).

7638422977 is a wasteful number, since it uses less digits than its factorization.

7638422977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434158.

The product of its digits is 7112448, while the sum is 55.

The square root of 7638422977 is about 87398.0719295340. The cubic root of 7638422977 is about 1969.4028764774.

The spelling of 7638422977 in words is "seven billion, six hundred thirty-eight million, four hundred twenty-two thousand, nine hundred seventy-seven".