76721800 has 24 divisors (see below), whose sum is σ = 178378650. Its totient is φ = 30688640.

The previous prime is 76721789. The next prime is 76721803. The reversal of 76721800 is 812767.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 63776196 + 12945604 = 7986^2 + 3598^2 .

It is not an unprimeable number, because it can be changed into a prime (76721803) 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 5 ways as a sum of consecutive naturals, for example, 191605 + ... + 192004.

Almost surely, 2^76721800 is an apocalyptic number.

It is an amenable number.

76721800 is an abundant number, since it is smaller than the sum of its proper divisors (101656850).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

76721800 is a wasteful number, since it uses less digits than its factorization.

76721800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383625 (or 383616 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 76721800 is about 8759.0981270905. The cubic root of 76721800 is about 424.9191080185.

The spelling of 76721800 in words is "seventy-six million, seven hundred twenty-one thousand, eight hundred".