77744427 has 8 divisors (see below), whose sum is σ = 104151360. Its totient is φ = 51583560.

The previous prime is 77744413. The next prime is 77744441. The reversal of 77744427 is 72444777.

It is an interprime number because it is at equal distance from previous prime (77744413) and next prime (77744441).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77744427 - 2⁸ = 77744171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77744467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60777 + ... + 62042.

It is an arithmetic number, because the mean of its divisors is an integer number (13018920).

Almost surely, 2^77744427 is an apocalyptic number.

77744427 is a deficient number, since it is larger than the sum of its proper divisors (26406933).

77744427 is a wasteful number, since it uses less digits than its factorization.

77744427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123033.

The product of its digits is 307328, while the sum is 42.

The square root of 77744427 is about 8817.2800227735. The cubic root of 77744427 is about 426.7987010668.

The spelling of 77744427 in words is "seventy-seven million, seven hundred forty-four thousand, four hundred twenty-seven".