76713821 has 4 divisors (see below), whose sum is σ = 76802172. Its totient is φ = 76625472.

The previous prime is 76713803. The next prime is 76713827. The reversal of 76713821 is 12831767.

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 67010596 + 9703225 = 8186^2 + 3115^2 .

It is a cyclic number.

It is not a de Polignac number, because 76713821 - 2¹⁸ = 76451677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76713827) 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, 42860 + ... + 44613.

It is an arithmetic number, because the mean of its divisors is an integer number (19200543).

Almost surely, 2^76713821 is an apocalyptic number.

It is an amenable number.

76713821 is a deficient number, since it is larger than the sum of its proper divisors (88351).

76713821 is an equidigital number, since it uses as much as digits as its factorization.

76713821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88350.

The product of its digits is 14112, while the sum is 35.

The square root of 76713821 is about 8758.6426459812. The cubic root of 76713821 is about 424.9043771029.

The spelling of 76713821 in words is "seventy-six million, seven hundred thirteen thousand, eight hundred twenty-one".