777796321 has 5 divisors (see below), whose sum is σ = 782481841. Its totient is φ = 773138858.

The previous prime is 777796309. The next prime is 777796399. The reversal of 777796321 is 123697777.

The square root of 777796321 is 27889.

It is a perfect power (a square, a biquadrate), and thus also a powerful number.

It is not a de Polignac number, because 777796321 - 2¹¹ = 777794273 is a prime.

It is a super-2 number, since 2×777796321² = 1209934233922270082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (777796301) by changing a digit.

It is a polite number, since it can be written in 4 ways as a sum of consecutive naturals, for example, 4657380 + ... + 4657546.

Almost surely, 2^777796321 is an apocalyptic number.

777796321 is the 27889-th square number.

777796321 is the 13945-th centered octagonal number.

It is an amenable number.

777796321 is a deficient number, since it is larger than the sum of its proper divisors (4685520).

777796321 is an frugal number, since it uses more digits than its factorization.

777796321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668 (or 167 counting only the distinct ones).

The product of its digits is 777924, while the sum is 49.

The cubic root of 777796321 is about 919.6487005467.

Multiplying 777796321 by its sum of digits (49), we get a square (38112019729 = 195223²).

Multiplying 777796321 by its product of digits (777924), we get a square (605066425217604 = 24598098²).

It can be divided in two parts, 77779 and 6321, that added together give a square (84100 = 290²).

The spelling of 777796321 in words is "seven hundred seventy-seven million, seven hundred ninety-six thousand, three hundred twenty-one".