76705921 has 8 divisors (see below), whose sum is σ = 83413800. Its totient is φ = 70242048.

The previous prime is 76705891. The next prime is 76705931. The reversal of 76705921 is 12950767.

It can be written as a sum of positive squares in 4 ways, for example, as 23415921 + 53290000 = 4839^2 + 7300^2 .

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 76705921 - 2²³ = 68317313 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76705931) 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, 60346 + ... + 61603.

It is an arithmetic number, because the mean of its divisors is an integer number (10426725).

Almost surely, 2^76705921 is an apocalyptic number.

It is an amenable number.

76705921 is a deficient number, since it is larger than the sum of its proper divisors (6707879).

76705921 is a wasteful number, since it uses less digits than its factorization.

76705921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122003.

The product of its (nonzero) digits is 26460, while the sum is 37.

The square root of 76705921 is about 8758.1916512486. The cubic root of 76705921 is about 424.8897910315.

The spelling of 76705921 in words is "seventy-six million, seven hundred five thousand, nine hundred twenty-one".