770349821 has 4 divisors (see below), whose sum is σ = 770418012. Its totient is φ = 770281632.

The previous prime is 770349803. The next prime is 770349829. The reversal of 770349821 is 128943077.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 209844196 + 560505625 = 14486^2 + 23675^2 .

It is a cyclic number.

It is not a de Polignac number, because 770349821 - 2¹⁰ = 770348797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (770349829) 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, 12656 + ... + 41241.

It is an arithmetic number, because the mean of its divisors is an integer number (192604503).

Almost surely, 2^770349821 is an apocalyptic number.

It is an amenable number.

770349821 is a deficient number, since it is larger than the sum of its proper divisors (68191).

770349821 is a wasteful number, since it uses less digits than its factorization.

770349821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68190.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 770349821 is about 27755.1764721466. The cubic root of 770349821 is about 916.7044269771.

The spelling of 770349821 in words is "seven hundred seventy million, three hundred forty-nine thousand, eight hundred twenty-one".