77331427 has 2 divisors, whose sum is σ = 77331428. Its totient is φ = 77331426.

The previous prime is 77331421. The next prime is 77331461. The reversal of 77331427 is 72413377.

It is an a-pointer prime, because the next prime (77331461) can be obtained adding 77331427 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77331427 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77331392 and 77331401.

It is not a weakly prime, because it can be changed into another prime (77331421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38665713 + 38665714.

It is an arithmetic number, because the mean of its divisors is an integer number (38665714).

Almost surely, 2^77331427 is an apocalyptic number.

77331427 is a deficient number, since it is larger than the sum of its proper divisors (1).

77331427 is an equidigital number, since it uses as much as digits as its factorization.

77331427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24696, while the sum is 34.

The square root of 77331427 is about 8793.8289157795. The cubic root of 77331427 is about 426.0416010715.

The spelling of 77331427 in words is "seventy-seven million, three hundred thirty-one thousand, four hundred twenty-seven".