77321239 has 4 divisors (see below), whose sum is σ = 80683056. Its totient is φ = 73959424.

The previous prime is 77321227. The next prime is 77321249. The reversal of 77321239 is 93212377.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93212377 = 17 ⋅5483081.

It is a cyclic number.

It is not a de Polignac number, because 77321239 - 2²³ = 68932631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77321249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1680874 + ... + 1680919.

It is an arithmetic number, because the mean of its divisors is an integer number (20170764).

Almost surely, 2^77321239 is an apocalyptic number.

77321239 is a deficient number, since it is larger than the sum of its proper divisors (3361817).

77321239 is a wasteful number, since it uses less digits than its factorization.

77321239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3361816.

The product of its digits is 15876, while the sum is 34.

The square root of 77321239 is about 8793.2496268444. The cubic root of 77321239 is about 426.0228906859.

The spelling of 77321239 in words is "seventy-seven million, three hundred twenty-one thousand, two hundred thirty-nine".