87662778 has 32 divisors (see below), whose sum is σ = 212160384. Its totient is φ = 23572992.

The previous prime is 87662759. The next prime is 87662779. The reversal of 87662778 is 87726678.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 87662778.

It is not an unprimeable number, because it can be changed into a prime (87662779) 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 15 ways as a sum of consecutive naturals, for example, 60675 + ... + 62102.

It is an arithmetic number, because the mean of its divisors is an integer number (6630012).

Almost surely, 2^87662778 is an apocalyptic number.

87662778 is an abundant number, since it is smaller than the sum of its proper divisors (124497606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87662778 is a wasteful number, since it uses less digits than its factorization.

87662778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122806.

The product of its digits is 1580544, while the sum is 51.

The square root of 87662778 is about 9362.8402741903. The cubic root of 87662778 is about 444.2271279291.

The spelling of 87662778 in words is "eighty-seven million, six hundred sixty-two thousand, seven hundred seventy-eight".