76042721 has 8 divisors (see below), whose sum is σ = 78653184. Its totient is φ = 73442160.

The previous prime is 76042711. The next prime is 76042723. The reversal of 76042721 is 12724067.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-76042721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76042723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15275 + ... + 19631.

It is an arithmetic number, because the mean of its divisors is an integer number (9831648).

Almost surely, 2^76042721 is an apocalyptic number.

It is an amenable number.

76042721 is a deficient number, since it is larger than the sum of its proper divisors (2610463).

76042721 is a wasteful number, since it uses less digits than its factorization.

76042721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4951.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 76042721 is about 8720.2477602417. The cubic root of 76042721 is about 423.6617113743.

Adding to 76042721 its reverse (12724067), we get a palindrome (88766788).

The spelling of 76042721 in words is "seventy-six million, forty-two thousand, seven hundred twenty-one".