77020321 has 4 divisors (see below), whose sum is σ = 88023232. Its totient is φ = 66017412.

The previous prime is 77020309. The next prime is 77020331. The reversal of 77020321 is 12302077.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77020321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77020292 and 77020301.

It is not an unprimeable number, because it can be changed into a prime (77020301) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5501445 + ... + 5501458.

It is an arithmetic number, because the mean of its divisors is an integer number (22005808).

Almost surely, 2^77020321 is an apocalyptic number.

It is an amenable number.

77020321 is a deficient number, since it is larger than the sum of its proper divisors (11002911).

77020321 is a wasteful number, since it uses less digits than its factorization.

77020321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11002910.

The product of its (nonzero) digits is 588, while the sum is 22.

The square root of 77020321 is about 8776.1222074445. The cubic root of 77020321 is about 425.4695083514.

Adding to 77020321 its reverse (12302077), we get a palindrome (89322398).

The spelling of 77020321 in words is "seventy-seven million, twenty thousand, three hundred twenty-one".