76728868621739 has 4 divisors (see below), whose sum is σ = 77700120123360. Its totient is φ = 75757617120120.

The previous prime is 76728868621679. The next prime is 76728868621759. The reversal of 76728868621739 is 93712686882767.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-76728868621739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76728868621759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 485625750692 + ... + 485625750849.

It is an arithmetic number, because the mean of its divisors is an integer number (19425030030840).

Almost surely, 2^{76728868621739} is an apocalyptic number.

76728868621739 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

76728868621739 is a deficient number, since it is larger than the sum of its proper divisors (971251501621).

76728868621739 is an equidigital number, since it uses as much as digits as its factorization.

76728868621739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 971251501620.

The product of its digits is 4096770048, while the sum is 80.

The spelling of 76728868621739 in words is "seventy-six trillion, seven hundred twenty-eight billion, eight hundred sixty-eight million, six hundred twenty-one thousand, seven hundred thirty-nine".