77922869 has 2 divisors, whose sum is σ = 77922870. Its totient is φ = 77922868.

The previous prime is 77922863. The next prime is 77922881. The reversal of 77922869 is 96822977.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39853969 + 38068900 = 6313^2 + 6170^2 .

It is a cyclic number.

It is not a de Polignac number, because 77922869 - 2²⁰ = 76874293 is a prime.

It is a super-2 number, since 2×77922869² = 12143947026382322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77922863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38961434 + 38961435.

It is an arithmetic number, because the mean of its divisors is an integer number (38961435).

Almost surely, 2^77922869 is an apocalyptic number.

It is an amenable number.

77922869 is a deficient number, since it is larger than the sum of its proper divisors (1).

77922869 is an equidigital number, since it uses as much as digits as its factorization.

77922869 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 77922869 is about 8827.3931032893. The cubic root of 77922869 is about 427.1249864928.

The spelling of 77922869 in words is "seventy-seven million, nine hundred twenty-two thousand, eight hundred sixty-nine".