77224289 has 2 divisors, whose sum is σ = 77224290. Its totient is φ = 77224288.

The previous prime is 77224283. The next prime is 77224331. The reversal of 77224289 is 98242277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40742689 + 36481600 = 6383^2 + 6040^2 .

It is a cyclic number.

It is not a de Polignac number, because 77224289 - 2²⁴ = 60447073 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (77224283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38612144 + 38612145.

It is an arithmetic number, because the mean of its divisors is an integer number (38612145).

Almost surely, 2^77224289 is an apocalyptic number.

It is an amenable number.

77224289 is a deficient number, since it is larger than the sum of its proper divisors (1).

77224289 is an equidigital number, since it uses as much as digits as its factorization.

77224289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 41.

The square root of 77224289 is about 8787.7351462137. The cubic root of 77224289 is about 425.8447585430.

The spelling of 77224289 in words is "seventy-seven million, two hundred twenty-four thousand, two hundred eighty-nine".