7664136844 has 72 divisors (see below), whose sum is σ = 16831735200. Its totient is φ = 3026628864.

The previous prime is 7664136817. The next prime is 7664136899. The reversal of 7664136844 is 4486314667.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1646232 + ... + 1650880.

It is an arithmetic number, because the mean of its divisors is an integer number (233774100).

Almost surely, 2^7664136844 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7664136844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8415867600).

7664136844 is an abundant number, since it is smaller than the sum of its proper divisors (9167598356).

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

7664136844 is a wasteful number, since it uses less digits than its factorization.

7664136844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5327 (or 5318 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 49.

The square root of 7664136844 is about 87545.0560797125. The cubic root of 7664136844 is about 1971.6103235809.

The spelling of 7664136844 in words is "seven billion, six hundred sixty-four million, one hundred thirty-six thousand, eight hundred forty-four".