764077821 has 8 divisors (see below), whose sum is σ = 1097137440. Its totient is φ = 470201712.

The previous prime is 764077807. The next prime is 764077823. The reversal of 764077821 is 128770467.

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

It is not a de Polignac number, because 764077821 - 2⁶ = 764077757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (764077823) 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 7 ways as a sum of consecutive naturals, for example, 9795831 + ... + 9795908.

It is an arithmetic number, because the mean of its divisors is an integer number (137142180).

Almost surely, 2^764077821 is an apocalyptic number.

It is an amenable number.

764077821 is a deficient number, since it is larger than the sum of its proper divisors (333059619).

764077821 is a wasteful number, since it uses less digits than its factorization.

764077821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19591755.

The product of its (nonzero) digits is 131712, while the sum is 42.

The square root of 764077821 is about 27641.9576188084. The cubic root of 764077821 is about 914.2097832717.

The spelling of 764077821 in words is "seven hundred sixty-four million, seventy-seven thousand, eight hundred twenty-one".