770321664 has 432 divisors, whose sum is σ = 2767739520. Its totient is φ = 209018880.

The previous prime is 770321659. The next prime is 770321683. The reversal of 770321664 is 466123077.

It is a tau number, because it is divible by the number of its divisors (432).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 12628194 + ... + 12628254.

Almost surely, 2^770321664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 770321664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1383869760).

770321664 is an abundant number, since it is smaller than the sum of its proper divisors (1997417856).

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

770321664 is an equidigital number, since it uses as much as digits as its factorization.

770321664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128 (or 102 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 770321664 is about 27754.6692287982. The cubic root of 770321664 is about 916.6932580422.

The spelling of 770321664 in words is "seven hundred seventy million, three hundred twenty-one thousand, six hundred sixty-four".