7644139968 has 56 divisors (see below), whose sum is σ = 20606753808. Its totient is φ = 2499966976.

The previous prime is 7644139967. The next prime is 7644139969. The reversal of 7644139968 is 8699314467.

It is an interprime number because it is at equal distance from previous prime (7644139967) and next prime (7644139969).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7644139961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 365421 + ... + 385772.

Almost surely, 2^7644139968 is an apocalyptic number.

It is an amenable number.

7644139968 is an abundant number, since it is smaller than the sum of its proper divisors (12962613840).

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

7644139968 is a wasteful number, since it uses less digits than its factorization.

7644139968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751261 (or 751251 counting only the distinct ones).

The product of its digits is 7838208, while the sum is 57.

The square root of 7644139968 is about 87430.7724316788. The cubic root of 7644139968 is about 1969.8940882877.

The spelling of 7644139968 in words is "seven billion, six hundred forty-four million, one hundred thirty-nine thousand, nine hundred sixty-eight".