77428339 has 4 divisors (see below), whose sum is σ = 77466456. Its totient is φ = 77390224.

The previous prime is 77428331. The next prime is 77428343. The reversal of 77428339 is 93382477.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77428339 - 2³ = 77428331 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77428295 and 77428304.

It is not an unprimeable number, because it can be changed into a prime (77428331) 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, 15829 + ... + 20134.

It is an arithmetic number, because the mean of its divisors is an integer number (19366614).

Almost surely, 2^77428339 is an apocalyptic number.

77428339 is a deficient number, since it is larger than the sum of its proper divisors (38117).

77428339 is a wasteful number, since it uses less digits than its factorization.

77428339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38116.

The product of its digits is 254016, while the sum is 43.

The square root of 77428339 is about 8799.3374182378. The cubic root of 77428339 is about 426.2194990258.

The spelling of 77428339 in words is "seventy-seven million, four hundred twenty-eight thousand, three hundred thirty-nine".