83764721 has 2 divisors, whose sum is σ = 83764722. Its totient is φ = 83764720.

The previous prime is 83764693. The next prime is 83764739. The reversal of 83764721 is 12746738.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73273600 + 10491121 = 8560^2 + 3239^2 .

It is a cyclic number.

It is not a de Polignac number, because 83764721 - 2¹⁸ = 83502577 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (83764771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41882360 + 41882361.

It is an arithmetic number, because the mean of its divisors is an integer number (41882361).

Almost surely, 2^83764721 is an apocalyptic number.

It is an amenable number.

83764721 is a deficient number, since it is larger than the sum of its proper divisors (1).

83764721 is an equidigital number, since it uses as much as digits as its factorization.

83764721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 38.

The square root of 83764721 is about 9152.3068676700. The cubic root of 83764721 is about 437.5426392184.

The spelling of 83764721 in words is "eighty-three million, seven hundred sixty-four thousand, seven hundred twenty-one".