76813729 has 4 divisors (see below), whose sum is σ = 76877460. Its totient is φ = 76750000.

The previous prime is 76813727. The next prime is 76813747. The reversal of 76813729 is 92731867.

It is a happy number.

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 76527504 + 286225 = 8748^2 + 535^2 .

It is a cyclic number.

It is not a de Polignac number, because 76813729 - 2¹ = 76813727 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76813727) 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, 30022 + ... + 32479.

It is an arithmetic number, because the mean of its divisors is an integer number (19219365).

Almost surely, 2^76813729 is an apocalyptic number.

It is an amenable number.

76813729 is a deficient number, since it is larger than the sum of its proper divisors (63731).

76813729 is a wasteful number, since it uses less digits than its factorization.

76813729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63730.

The product of its digits is 127008, while the sum is 43.

The square root of 76813729 is about 8764.3441853912. The cubic root of 76813729 is about 425.0887547047.

The spelling of 76813729 in words is "seventy-six million, eight hundred thirteen thousand, seven hundred twenty-nine".