77990233 has 2 divisors, whose sum is σ = 77990234. Its totient is φ = 77990232.

The previous prime is 77990219. The next prime is 77990239. The reversal of 77990233 is 33209977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42146064 + 35844169 = 6492^2 + 5987^2 .

It is a cyclic number.

It is not a de Polignac number, because 77990233 - 2⁵ = 77990201 is a prime.

It is not a weakly prime, because it can be changed into another prime (77990239) 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 as a sum of consecutive naturals, namely, 38995116 + 38995117.

It is an arithmetic number, because the mean of its divisors is an integer number (38995117).

Almost surely, 2^77990233 is an apocalyptic number.

It is an amenable number.

77990233 is a deficient number, since it is larger than the sum of its proper divisors (1).

77990233 is an equidigital number, since it uses as much as digits as its factorization.

77990233 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 71442, while the sum is 40.

The square root of 77990233 is about 8831.2079015274. The cubic root of 77990233 is about 427.2480336402.

The spelling of 77990233 in words is "seventy-seven million, nine hundred ninety thousand, two hundred thirty-three".