76720730 has 8 divisors (see below), whose sum is σ = 138097332. Its totient is φ = 30688288.

The previous prime is 76720687. The next prime is 76720739. The reversal of 76720730 is 3702767.

It can be written as a sum of positive squares in 2 ways, for example, as 74252689 + 2468041 = 8617^2 + 1571^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (76720739) 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, 3836027 + ... + 3836046.

Almost surely, 2^76720730 is an apocalyptic number.

76720730 is a deficient number, since it is larger than the sum of its proper divisors (61376602).

76720730 is a wasteful number, since it uses less digits than its factorization.

76720730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7672080.

The product of its (nonzero) digits is 12348, while the sum is 32.

The square root of 76720730 is about 8759.0370475298. The cubic root of 76720730 is about 424.9171326323.

The spelling of 76720730 in words is "seventy-six million, seven hundred twenty thousand, seven hundred thirty".