76565721 has 8 divisors (see below), whose sum is σ = 103235040. Its totient is φ = 50470112.

The previous prime is 76565719. The next prime is 76565729. The reversal of 76565721 is 12756567.

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

It is a cyclic number.

It is not a de Polignac number, because 76565721 - 2¹ = 76565719 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 76565721.

It is not an unprimeable number, because it can be changed into a prime (76565729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143115 + ... + 143648.

It is an arithmetic number, because the mean of its divisors is an integer number (12904380).

Almost surely, 2^76565721 is an apocalyptic number.

It is an amenable number.

76565721 is a deficient number, since it is larger than the sum of its proper divisors (26669319).

76565721 is a wasteful number, since it uses less digits than its factorization.

76565721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286855.

The product of its digits is 88200, while the sum is 39.

The square root of 76565721 is about 8750.1840552071. The cubic root of 76565721 is about 424.6307676611.

The spelling of 76565721 in words is "seventy-six million, five hundred sixty-five thousand, seven hundred twenty-one".