77945387 has 8 divisors (see below), whose sum is σ = 85989120. Its totient is φ = 70194240.

The previous prime is 77945341. The next prime is 77945389. The reversal of 77945387 is 78354977.

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

It is a cyclic number.

It is not a de Polignac number, because 77945387 - 2²⁰ = 76896811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77945389) by changing a digit.

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, 72587 + ... + 73652.

It is an arithmetic number, because the mean of its divisors is an integer number (10748640).

Almost surely, 2^77945387 is an apocalyptic number.

77945387 is a deficient number, since it is larger than the sum of its proper divisors (8043733).

77945387 is a wasteful number, since it uses less digits than its factorization.

77945387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146293.

The product of its digits is 1481760, while the sum is 50.

The square root of 77945387 is about 8828.6684726520. The cubic root of 77945387 is about 427.1661257812.

The spelling of 77945387 in words is "seventy-seven million, nine hundred forty-five thousand, three hundred eighty-seven".