77309321 has 4 divisors (see below), whose sum is σ = 78288000. Its totient is φ = 76330644.

The previous prime is 77309303. The next prime is 77309329. The reversal of 77309321 is 12390377.

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 not a de Polignac number, because 77309321 - 2¹⁸ = 77047177 is a prime.

It is a super-2 number, since 2×77309321² = 11953462226962082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77309329) 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, 489221 + ... + 489378.

It is an arithmetic number, because the mean of its divisors is an integer number (19572000).

Almost surely, 2^77309321 is an apocalyptic number.

It is an amenable number.

77309321 is a deficient number, since it is larger than the sum of its proper divisors (978679).

77309321 is an equidigital number, since it uses as much as digits as its factorization.

77309321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978678.

The product of its (nonzero) digits is 7938, while the sum is 32.

The square root of 77309321 is about 8792.5719217985. The cubic root of 77309321 is about 426.0010010483.

Adding to 77309321 its reverse (12390377), we get a palindrome (89699698).

The spelling of 77309321 in words is "seventy-seven million, three hundred nine thousand, three hundred twenty-one".