764012561 has 8 divisors (see below), whose sum is σ = 824752320. Its totient is φ = 703554192.

The previous prime is 764012539. The next prime is 764012603. The reversal of 764012561 is 165210467.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-764012561 is a prime.

It is a super-3 number, since 3×764012561³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (764012531) 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, 64685 + ... + 75578.

It is an arithmetic number, because the mean of its divisors is an integer number (103094040).

Almost surely, 2^764012561 is an apocalyptic number.

It is an amenable number.

764012561 is a deficient number, since it is larger than the sum of its proper divisors (60739759).

764012561 is a wasteful number, since it uses less digits than its factorization.

764012561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140695.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 764012561 is about 27640.7771417520. Note that the first 3 decimals coincide. The cubic root of 764012561 is about 914.1837549329.

The spelling of 764012561 in words is "seven hundred sixty-four million, twelve thousand, five hundred sixty-one".