76405321 has 4 divisors (see below), whose sum is σ = 76422852. Its totient is φ = 76387792.

The previous prime is 76405313. The next prime is 76405331. The reversal of 76405321 is 12350467.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 74046025 + 2359296 = 8605^2 + 1536^2 .

It is a cyclic number.

It is not a de Polignac number, because 76405321 - 2³ = 76405313 is a prime.

It is a super-2 number, since 2×76405321² = 11675546154226082, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 76405321.

It is not an unprimeable number, because it can be changed into a prime (76405331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3411 + ... + 12823.

It is an arithmetic number, because the mean of its divisors is an integer number (19105713).

Almost surely, 2^76405321 is an apocalyptic number.

It is an amenable number.

76405321 is a deficient number, since it is larger than the sum of its proper divisors (17531).

76405321 is an equidigital number, since it uses as much as digits as its factorization.

76405321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17530.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 76405321 is about 8741.0137283956. The cubic root of 76405321 is about 424.3340361205.

Adding to 76405321 its reverse (12350467), we get a palindrome (88755788).

The spelling of 76405321 in words is "seventy-six million, four hundred five thousand, three hundred twenty-one".