7640386641 has 20 divisors (see below), whose sum is σ = 11416135104. Its totient is φ = 5092378200.

The previous prime is 7640386627. The next prime is 7640386703. The reversal of 7640386641 is 1466830467.

It is a happy number.

It is not a de Polignac number, because 7640386641 - 2⁷ = 7640386513 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7640386141) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 444436 + ... + 461306.

Almost surely, 2^7640386641 is an apocalyptic number.

It is an amenable number.

7640386641 is a deficient number, since it is larger than the sum of its proper divisors (3775748463).

7640386641 is a wasteful number, since it uses less digits than its factorization.

7640386641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22474 (or 22465 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The square root of 7640386641 is about 87409.3052311938. The cubic root of 7640386641 is about 1969.5716248432.

The spelling of 7640386641 in words is "seven billion, six hundred forty million, three hundred eighty-six thousand, six hundred forty-one".