76387321 has 4 divisors (see below), whose sum is σ = 76659444. Its totient is φ = 76115200.

The previous prime is 76387319. The next prime is 76387327. The reversal of 76387321 is 12378367.

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

It can be written as a sum of positive squares in 2 ways, for example, as 67831696 + 8555625 = 8236^2 + 2925^2 .

It is a cyclic number.

It is not a de Polignac number, because 76387321 - 2¹ = 76387319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76387327) 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, 135640 + ... + 136201.

It is an arithmetic number, because the mean of its divisors is an integer number (19164861).

Almost surely, 2^76387321 is an apocalyptic number.

It is an amenable number.

76387321 is a deficient number, since it is larger than the sum of its proper divisors (272123).

76387321 is a wasteful number, since it uses less digits than its factorization.

76387321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272122.

The product of its digits is 42336, while the sum is 37.

The square root of 76387321 is about 8739.9840388870. The cubic root of 76387321 is about 424.3007111617.

The spelling of 76387321 in words is "seventy-six million, three hundred eighty-seven thousand, three hundred twenty-one".