87778144 has 24 divisors (see below), whose sum is σ = 174900600. Its totient is φ = 43358976.

The previous prime is 87778127. The next prime is 87778151. The reversal of 87778144 is 44187778.

It is a junction number, because it is equal to n+sod(n) for n = 87778094 and 87778103.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 13869 + ... + 19180.

It is an arithmetic number, because the mean of its divisors is an integer number (7287525).

Almost surely, 2^87778144 is an apocalyptic number.

It is an amenable number.

87778144 is a deficient number, since it is larger than the sum of its proper divisors (87122456).

87778144 is a wasteful number, since it uses less digits than its factorization.

87778144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33142 (or 33134 counting only the distinct ones).

The product of its digits is 351232, while the sum is 46.

The square root of 87778144 is about 9368.9990927527. Note that the first 3 decimals coincide. The cubic root of 87778144 is about 444.4219131541.

The spelling of 87778144 in words is "eighty-seven million, seven hundred seventy-eight thousand, one hundred forty-four".