77213293 has 2 divisors, whose sum is σ = 77213294. Its totient is φ = 77213292.

The previous prime is 77213273. The next prime is 77213299. The reversal of 77213293 is 39231277.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44916804 + 32296489 = 6702^2 + 5683^2 .

It is a cyclic number.

It is not a de Polignac number, because 77213293 - 2⁹ = 77212781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77213299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38606646 + 38606647.

It is an arithmetic number, because the mean of its divisors is an integer number (38606647).

Almost surely, 2^77213293 is an apocalyptic number.

It is an amenable number.

77213293 is a deficient number, since it is larger than the sum of its proper divisors (1).

77213293 is an equidigital number, since it uses as much as digits as its factorization.

77213293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15876, while the sum is 34.

The square root of 77213293 is about 8787.1094792315. The cubic root of 77213293 is about 425.8245455103.

The spelling of 77213293 in words is "seventy-seven million, two hundred thirteen thousand, two hundred ninety-three".