77427138 has 16 divisors (see below), whose sum is σ = 155136096. Its totient is φ = 25762080.

The previous prime is 77427127. The next prime is 77427167. The reversal of 77427138 is 83172477.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 77427096 and 77427105.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8083 + ... + 14838.

It is an arithmetic number, because the mean of its divisors is an integer number (9696006).

Almost surely, 2^77427138 is an apocalyptic number.

77427138 is an abundant number, since it is smaller than the sum of its proper divisors (77708958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77427138 is a wasteful number, since it uses less digits than its factorization.

77427138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23489.

The product of its digits is 65856, while the sum is 39.

The square root of 77427138 is about 8799.2691741985. The cubic root of 77427138 is about 426.2172953009.

The spelling of 77427138 in words is "seventy-seven million, four hundred twenty-seven thousand, one hundred thirty-eight".