77321305 has 8 divisors (see below), whose sum is σ = 95293512. Its totient is φ = 60185088.

The previous prime is 77321297. The next prime is 77321311. The reversal of 77321305 is 50312377.

It can be written as a sum of positive squares in 4 ways, for example, as 10784656 + 66536649 = 3284^2 + 8157^2 .

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

It is not a de Polignac number, because 77321305 - 2³ = 77321297 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208792 + ... + 209161.

It is an arithmetic number, because the mean of its divisors is an integer number (11911689).

Almost surely, 2^77321305 is an apocalyptic number.

It is an amenable number.

77321305 is a deficient number, since it is larger than the sum of its proper divisors (17972207).

77321305 is a wasteful number, since it uses less digits than its factorization.

77321305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417995.

The product of its (nonzero) digits is 4410, while the sum is 28.

The square root of 77321305 is about 8793.2533797224. The cubic root of 77321305 is about 426.0230119010.

The spelling of 77321305 in words is "seventy-seven million, three hundred twenty-one thousand, three hundred five".