77494477 has 2 divisors, whose sum is σ = 77494478. Its totient is φ = 77494476.

The previous prime is 77494421. The next prime is 77494489. The reversal of 77494477 is 77449477.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51423241 + 26071236 = 7171^2 + 5106^2 .

It is a cyclic number.

It is not a de Polignac number, because 77494477 - 2⁷ = 77494349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77494477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77494777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38747238 + 38747239.

It is an arithmetic number, because the mean of its divisors is an integer number (38747239).

Almost surely, 2^77494477 is an apocalyptic number.

It is an amenable number.

77494477 is a deficient number, since it is larger than the sum of its proper divisors (1).

77494477 is an equidigital number, since it uses as much as digits as its factorization.

77494477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1382976, while the sum is 49.

The square root of 77494477 is about 8803.0947399196. The cubic root of 77494477 is about 426.3408210255.

The spelling of 77494477 in words is "seventy-seven million, four hundred ninety-four thousand, four hundred seventy-seven".