73706821 has 2 divisors, whose sum is σ = 73706822. Its totient is φ = 73706820.

The previous prime is 73706803. The next prime is 73706837. The reversal of 73706821 is 12860737.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66341025 + 7365796 = 8145^2 + 2714^2 .

It is a cyclic number.

It is not a de Polignac number, because 73706821 - 2⁷ = 73706693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73706021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36853410 + 36853411.

It is an arithmetic number, because the mean of its divisors is an integer number (36853411).

Almost surely, 2^73706821 is an apocalyptic number.

It is an amenable number.

73706821 is a deficient number, since it is larger than the sum of its proper divisors (1).

73706821 is an equidigital number, since it uses as much as digits as its factorization.

73706821 is an evil number, because the sum of its binary digits is even.

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

The square root of 73706821 is about 8585.2676720065. The cubic root of 73706821 is about 419.2784682719.

The spelling of 73706821 in words is "seventy-three million, seven hundred six thousand, eight hundred twenty-one".