76721801 has 4 divisors (see below), whose sum is σ = 82623492. Its totient is φ = 70820112.

The previous prime is 76721789. The next prime is 76721803. The reversal of 76721801 is 10812767.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31091776 + 45630025 = 5576^2 + 6755^2 .

It is a cyclic number.

It is not a de Polignac number, because 76721801 - 2²⁶ = 9612937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76721803) 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, 2950826 + ... + 2950851.

It is an arithmetic number, because the mean of its divisors is an integer number (20655873).

Almost surely, 2^76721801 is an apocalyptic number.

It is an amenable number.

76721801 is a deficient number, since it is larger than the sum of its proper divisors (5901691).

76721801 is a wasteful number, since it uses less digits than its factorization.

76721801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5901690.

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 76721801 is about 8759.0981841740. The cubic root of 76721801 is about 424.9191098647.

The spelling of 76721801 in words is "seventy-six million, seven hundred twenty-one thousand, eight hundred one".