77246881 has 2 divisors, whose sum is σ = 77246882. Its totient is φ = 77246880.

The previous prime is 77246843. The next prime is 77246909. The reversal of 77246881 is 18864277.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41486481 + 35760400 = 6441^2 + 5980^2 .

It is a cyclic number.

It is not a de Polignac number, because 77246881 - 2⁹ = 77246369 is a prime.

It is a super-2 number, since 2×77246881² = 11934161248456322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77246821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38623440 + 38623441.

It is an arithmetic number, because the mean of its divisors is an integer number (38623441).

Almost surely, 2^77246881 is an apocalyptic number.

It is an amenable number.

77246881 is a deficient number, since it is larger than the sum of its proper divisors (1).

77246881 is an equidigital number, since it uses as much as digits as its factorization.

77246881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150528, while the sum is 43.

The square root of 77246881 is about 8789.0204801218. The cubic root of 77246881 is about 425.8862815184.

The spelling of 77246881 in words is "seventy-seven million, two hundred forty-six thousand, eight hundred eighty-one".