87778143 has 24 divisors (see below), whose sum is σ = 136581120. Its totient is φ = 54164880.

The previous prime is 87778127. The next prime is 87778151. The reversal of 87778143 is 34187778.

It is a happy number.

It is not a de Polignac number, because 87778143 - 2⁴ = 87778127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87778343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 423 + ... + 13256.

It is an arithmetic number, because the mean of its divisors is an integer number (5690880).

Almost surely, 2^87778143 is an apocalyptic number.

87778143 is a deficient number, since it is larger than the sum of its proper divisors (48802977).

87778143 is a wasteful number, since it uses less digits than its factorization.

87778143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13739 (or 13736 counting only the distinct ones).

The product of its digits is 263424, while the sum is 45.

The square root of 87778143 is about 9368.9990393852. Note that the first 3 decimals coincide. The cubic root of 87778143 is about 444.4219114664.

The spelling of 87778143 in words is "eighty-seven million, seven hundred seventy-eight thousand, one hundred forty-three".