764123191720 has 64 divisors (see below), whose sum is σ = 1965594729600. Its totient is φ = 261890891520.

The previous prime is 764123191717. The next prime is 764123191723. The reversal of 764123191720 is 27191321467.

It is an interprime number because it is at equal distance from previous prime (764123191717) and next prime (764123191723).

It is not an unprimeable number, because it can be changed into a prime (764123191723) 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, 291675 + ... + 1270165.

It is an arithmetic number, because the mean of its divisors is an integer number (30712417650).

Almost surely, 2^764123191720 is an apocalyptic number.

764123191720 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

764123191720 is an abundant number, since it is smaller than the sum of its proper divisors (1201471537880).

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

764123191720 is a wasteful number, since it uses less digits than its factorization.

764123191720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981298 (or 981294 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 43.

The spelling of 764123191720 in words is "seven hundred sixty-four billion, one hundred twenty-three million, one hundred ninety-one thousand, seven hundred twenty".