7638706 has 4 divisors (see below), whose sum is σ = 11458062. Its totient is φ = 3819352.

The previous prime is 7638689. The next prime is 7638707. The reversal of 7638706 is 6078367.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6078367 = 17 ⋅357551.

It can be written as a sum of positive squares in only one way, i.e., 4431025 + 3207681 = 2105^2 + 1791^2 .

It is not an unprimeable number, because it can be changed into a prime (7638707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1909675 + ... + 1909678.

Almost surely, 2^7638706 is an apocalyptic number.

7638706 is a deficient number, since it is larger than the sum of its proper divisors (3819356).

7638706 is a wasteful number, since it uses less digits than its factorization.

7638706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3819355.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 7638706 is about 2763.8209059199. The cubic root of 7638706 is about 196.9427199972.

It can be divided in two parts, 763870 and 6, that added together give a square (763876 = 874²).

The spelling of 7638706 in words is "seven million, six hundred thirty-eight thousand, seven hundred six".