77220893 has 2 divisors, whose sum is σ = 77220894. Its totient is φ = 77220892.

The previous prime is 77220811. The next prime is 77220901. The reversal of 77220893 is 39802277.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62758084 + 14462809 = 7922^2 + 3803^2 .

It is an emirp because it is prime and its reverse (39802277) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77220893 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77220593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38610446 + 38610447.

It is an arithmetic number, because the mean of its divisors is an integer number (38610447).

Almost surely, 2^77220893 is an apocalyptic number.

It is an amenable number.

77220893 is a deficient number, since it is larger than the sum of its proper divisors (1).

77220893 is an equidigital number, since it uses as much as digits as its factorization.

77220893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 77220893 is about 8787.5419202414. The cubic root of 77220893 is about 425.8385161633.

The spelling of 77220893 in words is "seventy-seven million, two hundred twenty thousand, eight hundred ninety-three".