77328817 has 4 divisors (see below), whose sum is σ = 77464816. Its totient is φ = 77192820.

The previous prime is 77328791. The next prime is 77328821. The reversal of 77328817 is 71882377.

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-77328817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77328847) 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, 67143 + ... + 68284.

It is an arithmetic number, because the mean of its divisors is an integer number (19366204).

Almost surely, 2^77328817 is an apocalyptic number.

It is an amenable number.

77328817 is a deficient number, since it is larger than the sum of its proper divisors (135999).

77328817 is a wasteful number, since it uses less digits than its factorization.

77328817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135998.

The product of its digits is 131712, while the sum is 43.

The square root of 77328817 is about 8793.6805150062. The cubic root of 77328817 is about 426.0368079314.

The spelling of 77328817 in words is "seventy-seven million, three hundred twenty-eight thousand, eight hundred seventeen".