77145447 has 8 divisors (see below), whose sum is σ = 103542400. Its totient is φ = 51089400.

The previous prime is 77145421. The next prime is 77145449. The reversal of 77145447 is 74454177.

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

It is not a de Polignac number, because 77145447 - 2²² = 72951143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77145449) 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, 84697 + ... + 85602.

It is an arithmetic number, because the mean of its divisors is an integer number (12942800).

Almost surely, 2^77145447 is an apocalyptic number.

77145447 is a deficient number, since it is larger than the sum of its proper divisors (26396953).

77145447 is a wasteful number, since it uses less digits than its factorization.

77145447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170453.

The product of its digits is 109760, while the sum is 39.

The square root of 77145447 is about 8783.2480894029. The cubic root of 77145447 is about 425.6997873804.

The spelling of 77145447 in words is "seventy-seven million, one hundred forty-five thousand, four hundred forty-seven".