7638951649 has 16 divisors (see below), whose sum is σ = 9247564800. Its totient is φ = 6159988224.

The previous prime is 7638951641. The next prime is 7638951667. The reversal of 7638951649 is 9461598367.

It is a cyclic number.

It is not a de Polignac number, because 7638951649 - 2³ = 7638951641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7638951593 and 7638951602.

It is not an unprimeable number, because it can be changed into a prime (7638951641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 311757 + ... + 335365.

It is an arithmetic number, because the mean of its divisors is an integer number (577972800).

Almost surely, 2^7638951649 is an apocalyptic number.

It is an amenable number.

7638951649 is a deficient number, since it is larger than the sum of its proper divisors (1608613151).

7638951649 is a wasteful number, since it uses less digits than its factorization.

7638951649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26352.

The product of its digits is 9797760, while the sum is 58.

The square root of 7638951649 is about 87401.0963832834. The cubic root of 7638951649 is about 1969.4483109928.

The spelling of 7638951649 in words is "seven billion, six hundred thirty-eight million, nine hundred fifty-one thousand, six hundred forty-nine".