76646321 has 8 divisors (see below), whose sum is σ = 78286824. Its totient is φ = 75013120.

The previous prime is 76646303. The next prime is 76646329. The reversal of 76646321 is 12364667.

It can be written as a sum of positive squares in 4 ways, for example, as 38688400 + 37957921 = 6220^2 + 6161^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 76646321 - 2²⁶ = 9537457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76646329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22865 + ... + 26001.

It is an arithmetic number, because the mean of its divisors is an integer number (9785853).

Almost surely, 2^76646321 is an apocalyptic number.

It is an amenable number.

76646321 is a deficient number, since it is larger than the sum of its proper divisors (1640503).

76646321 is a wasteful number, since it uses less digits than its factorization.

76646321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3651.

The product of its digits is 36288, while the sum is 35.

The square root of 76646321 is about 8754.7884611794. The cubic root of 76646321 is about 424.7797169861.

It can be divided in two parts, 76646 and 321, that added together give a palindrome (76967).

The spelling of 76646321 in words is "seventy-six million, six hundred forty-six thousand, three hundred twenty-one".