7639641 has 6 divisors (see below), whose sum is σ = 11035050. Its totient is φ = 5093088.

The previous prime is 7639637. The next prime is 7639663. The reversal of 7639641 is 1469367.

7639641 is a `hidden beast` number, since 7 + 6 + 3 + 9 + 641 = 666.

It can be written as a sum of positive squares in only one way, i.e., 5760000 + 1879641 = 2400^2 + 1371^2 .

It is not a de Polignac number, because 7639641 - 2² = 7639637 is a prime.

It is a super-2 number, since 2×7639641² = 116728229217762, which contains 22 as substring.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 7639596 and 7639605.

It is not an unprimeable number, because it can be changed into a prime (7639601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 424416 + ... + 424433.

It is an arithmetic number, because the mean of its divisors is an integer number (1839175).

Almost surely, 2^7639641 is an apocalyptic number.

It is an amenable number.

7639641 is a deficient number, since it is larger than the sum of its proper divisors (3395409).

7639641 is a wasteful number, since it uses less digits than its factorization.

7639641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848855 (or 848852 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 7639641 is about 2763.9900506333. The cubic root of 7639641 is about 196.9507551248.

It can be divided in two parts, 763 and 9641, that added together give a square (10404 = 102²).

The spelling of 7639641 in words is "seven million, six hundred thirty-nine thousand, six hundred forty-one".