7638691 has 4 divisors (see below), whose sum is σ = 7970832. Its totient is φ = 7306552.

The previous prime is 7638689. The next prime is 7638707. The reversal of 7638691 is 1968367.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1968367 = 53 ⋅37139.

It is a cyclic number.

It is not a de Polignac number, because 7638691 - 2¹ = 7638689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7638601) 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, 166036 + ... + 166081.

It is an arithmetic number, because the mean of its divisors is an integer number (1992708).

Almost surely, 2^7638691 is an apocalyptic number.

7638691 is a deficient number, since it is larger than the sum of its proper divisors (332141).

7638691 is a wasteful number, since it uses less digits than its factorization.

7638691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332140.

The product of its digits is 54432, while the sum is 40.

The square root of 7638691 is about 2763.8181922840. The cubic root of 7638691 is about 196.9425910861.

The spelling of 7638691 in words is "seven million, six hundred thirty-eight thousand, six hundred ninety-one".