77228969 has 2 divisors, whose sum is σ = 77228970. Its totient is φ = 77228968.

The previous prime is 77228951. The next prime is 77228981. The reversal of 77228969 is 96982277.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77228944 + 25 = 8788^2 + 5^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77228969 is a prime.

It is a super-2 number, since 2×77228969² = 11928627305605922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (77228929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38614484 + 38614485.

It is an arithmetic number, because the mean of its divisors is an integer number (38614485).

Almost surely, 2^77228969 is an apocalyptic number.

It is an amenable number.

77228969 is a deficient number, since it is larger than the sum of its proper divisors (1).

77228969 is an equidigital number, since it uses as much as digits as its factorization.

77228969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 50.

The square root of 77228969 is about 8788.0014223941. The cubic root of 77228969 is about 425.8533608159.

The spelling of 77228969 in words is "seventy-seven million, two hundred twenty-eight thousand, nine hundred sixty-nine".