76440305 has 4 divisors (see below), whose sum is σ = 91728372. Its totient is φ = 61152240.

The previous prime is 76440263. The next prime is 76440307. The reversal of 76440305 is 50304467.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50304467 = 233 ⋅215899.

It can be written as a sum of positive squares in 2 ways, for example, as 27384289 + 49056016 = 5233^2 + 7004^2 .

It is not a de Polignac number, because 76440305 - 2¹⁶ = 76374769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76440307) 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, 7644026 + ... + 7644035.

It is an arithmetic number, because the mean of its divisors is an integer number (22932093).

Almost surely, 2^76440305 is an apocalyptic number.

It is an amenable number.

76440305 is a deficient number, since it is larger than the sum of its proper divisors (15288067).

76440305 is a wasteful number, since it uses less digits than its factorization.

76440305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15288066.

The product of its (nonzero) digits is 10080, while the sum is 29.

The square root of 76440305 is about 8743.0146402714. The cubic root of 76440305 is about 424.3987900609.

The spelling of 76440305 in words is "seventy-six million, four hundred forty thousand, three hundred five".