77142447 has 24 divisors (see below), whose sum is σ = 121180176. Its totient is φ = 47091456.

The previous prime is 77142433. The next prime is 77142449. The reversal of 77142447 is 74424177.

77142447 is a `hidden beast` number, since 77 + 142 + 447 = 666.

It is not a de Polignac number, because 77142447 - 2⁶ = 77142383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77142449) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1153 + ... + 12474.

It is an arithmetic number, because the mean of its divisors is an integer number (5049174).

Almost surely, 2^77142447 is an apocalyptic number.

77142447 is a deficient number, since it is larger than the sum of its proper divisors (44037729).

77142447 is a wasteful number, since it uses less digits than its factorization.

77142447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13687 (or 13684 counting only the distinct ones).

The product of its digits is 43904, while the sum is 36.

The square root of 77142447 is about 8783.0773080965. The cubic root of 77142447 is about 425.6942691636.

The spelling of 77142447 in words is "seventy-seven million, one hundred forty-two thousand, four hundred forty-seven".