77001385 has 4 divisors (see below), whose sum is σ = 92401668. Its totient is φ = 61601104.

The previous prime is 77001377. The next prime is 77001389. The reversal of 77001385 is 58310077.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12809241 + 64192144 = 3579^2 + 8012^2 .

It is a cyclic number.

It is not a de Polignac number, because 77001385 - 2³ = 77001377 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77001389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7700134 + ... + 7700143.

It is an arithmetic number, because the mean of its divisors is an integer number (23100417).

Almost surely, 2^77001385 is an apocalyptic number.

It is an amenable number.

77001385 is a deficient number, since it is larger than the sum of its proper divisors (15400283).

77001385 is a wasteful number, since it uses less digits than its factorization.

77001385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15400282.

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 77001385 is about 8775.0433047365. The cubic root of 77001385 is about 425.4346372470.

The spelling of 77001385 in words is "seventy-seven million, one thousand, three hundred eighty-five".