77047969 has 2 divisors, whose sum is σ = 77047970. Its totient is φ = 77047968.

The previous prime is 77047967. The next prime is 77047991. The reversal of 77047969 is 96974077.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73753744 + 3294225 = 8588^2 + 1815^2 .

It is a cyclic number.

It is not a de Polignac number, because 77047969 - 2¹ = 77047967 is a prime.

It is a super-2 number, since 2×77047969² = 11872779054049922, which contains 22 as substring.

Together with 77047967, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (77047963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38523984 + 38523985.

It is an arithmetic number, because the mean of its divisors is an integer number (38523985).

Almost surely, 2^77047969 is an apocalyptic number.

It is an amenable number.

77047969 is a deficient number, since it is larger than the sum of its proper divisors (1).

77047969 is an equidigital number, since it uses as much as digits as its factorization.

77047969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 666792, while the sum is 49.

The square root of 77047969 is about 8777.6972492790. The cubic root of 77047969 is about 425.5204125523.

The spelling of 77047969 in words is "seventy-seven million, forty-seven thousand, nine hundred sixty-nine".