76721830 has 32 divisors (see below), whose sum is σ = 141847200. Its totient is φ = 29866752.

The previous prime is 76721809. The next prime is 76721837. The reversal of 76721830 is 3812767.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76721837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63714 + ... + 64906.

It is an arithmetic number, because the mean of its divisors is an integer number (4432725).

Almost surely, 2^76721830 is an apocalyptic number.

76721830 is a deficient number, since it is larger than the sum of its proper divisors (65125370).

76721830 is a wasteful number, since it uses less digits than its factorization.

76721830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1368.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 76721830 is about 8759.0998395954. The cubic root of 76721830 is about 424.9191634029.

The spelling of 76721830 in words is "seventy-six million, seven hundred twenty-one thousand, eight hundred thirty".