77320389 has 8 divisors (see below), whose sum is σ = 103228000. Its totient is φ = 51479856.

The previous prime is 77320387. The next prime is 77320391. The reversal of 77320389 is 98302377.

It is an interprime number because it is at equal distance from previous prime (77320387) and next prime (77320391).

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

It is not a de Polignac number, because 77320389 - 2¹ = 77320387 is a prime.

It is a super-2 number, since 2×77320389² = 11956885110222642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77320387) 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 7 ways as a sum of consecutive naturals, for example, 14014 + ... + 18735.

It is an arithmetic number, because the mean of its divisors is an integer number (12903500).

Almost surely, 2^77320389 is an apocalyptic number.

It is an amenable number.

77320389 is a deficient number, since it is larger than the sum of its proper divisors (25907611).

77320389 is a wasteful number, since it uses less digits than its factorization.

77320389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33539.

The product of its (nonzero) digits is 63504, while the sum is 39.

The square root of 77320389 is about 8793.2012941818. The cubic root of 77320389 is about 426.0213295763.

The spelling of 77320389 in words is "seventy-seven million, three hundred twenty thousand, three hundred eighty-nine".