76544321 has 6 divisors (see below), whose sum is σ = 89041410. Its totient is φ = 65609376.

The previous prime is 76544317. The next prime is 76544329. The reversal of 76544321 is 12344567.

It can be written as a sum of positive squares in only one way, i.e., 73530625 + 3013696 = 8575^2 + 1736^2 .

It is not a de Polignac number, because 76544321 - 2² = 76544317 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (76544329) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 781016 + ... + 781113.

It is an arithmetic number, because the mean of its divisors is an integer number (14840235).

Almost surely, 2^76544321 is an apocalyptic number.

It is an amenable number.

76544321 is a deficient number, since it is larger than the sum of its proper divisors (12497089).

76544321 is a wasteful number, since it uses less digits than its factorization.

76544321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1562143 (or 1562136 counting only the distinct ones).

The product of its digits is 20160, while the sum is 32.

The square root of 76544321 is about 8748.9611383295. The cubic root of 76544321 is about 424.5912027616.

Adding to 76544321 its reverse (12344567), we get a palindrome (88888888).

The spelling of 76544321 in words is "seventy-six million, five hundred forty-four thousand, three hundred twenty-one".