7664956728 has 64 divisors (see below), whose sum is σ = 22512470400. Its totient is φ = 2144042880.

The previous prime is 7664956723. The next prime is 7664956729. The reversal of 7664956728 is 8276594667.

It is a super-2 number, since 2×7664956728² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7664956721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1113258 + ... + 1120121.

It is an arithmetic number, because the mean of its divisors is an integer number (351757350).

Almost surely, 2^7664956728 is an apocalyptic number.

7664956728 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is an amenable number.

7664956728 is an abundant number, since it is smaller than the sum of its proper divisors (14847513672).

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

7664956728 is a wasteful number, since it uses less digits than its factorization.

7664956728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2233412 (or 2233408 counting only the distinct ones).

The product of its digits is 30481920, while the sum is 60.

The square root of 7664956728 is about 87549.7385946983. The cubic root of 7664956728 is about 1971.6806265235.

The spelling of 7664956728 in words is "seven billion, six hundred sixty-four million, nine hundred fifty-six thousand, seven hundred twenty-eight".