7639641009 has 144 divisors (see below), whose sum is σ = 15588961920. Its totient is φ = 3662366400.

The previous prime is 7639640989. The next prime is 7639641017. The reversal of 7639641009 is 9001469367.

7639641009 is a `hidden beast` number, since 7 + 639 + 6 + 4 + 1 + 0 + 0 + 9 = 666.

It is not a de Polignac number, because 7639641009 - 2⁵ = 7639640977 is a prime.

It is a super-2 number, since 2×7639641009² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7639642009) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 2079244 + ... + 2082914.

It is an arithmetic number, because the mean of its divisors is an integer number (108256680).

Almost surely, 2^7639641009 is an apocalyptic number.

It is an amenable number.

7639641009 is an abundant number, since it is smaller than the sum of its proper divisors (7949320911).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7639641009 is a wasteful number, since it uses less digits than its factorization.

7639641009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3729 (or 3705 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 7639641009 is about 87405.0399519387. The cubic root of 7639641009 is about 1969.5075520210.

The spelling of 7639641009 in words is "seven billion, six hundred thirty-nine million, six hundred forty-one thousand, nine".