77424869 has 2 divisors, whose sum is σ = 77424870. Its totient is φ = 77424868.

The previous prime is 77424863. The next prime is 77424881. The reversal of 77424869 is 96842477.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71199844 + 6225025 = 8438^2 + 2495^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77424869 is a prime.

It is a super-2 number, since 2×77424869² = 11989220679334322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77424863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38712434 + 38712435.

It is an arithmetic number, because the mean of its divisors is an integer number (38712435).

Almost surely, 2^77424869 is an apocalyptic number.

It is an amenable number.

77424869 is a deficient number, since it is larger than the sum of its proper divisors (1).

77424869 is an equidigital number, since it uses as much as digits as its factorization.

77424869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 47.

The square root of 77424869 is about 8799.1402420918. The cubic root of 77424869 is about 426.2131318318.

The spelling of 77424869 in words is "seventy-seven million, four hundred twenty-four thousand, eight hundred sixty-nine".