87868642 has 4 divisors (see below), whose sum is σ = 131802966. Its totient is φ = 43934320.

The previous prime is 87868639. The next prime is 87868657. The reversal of 87868642 is 24686878.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24686878 = 2 ⋅12343439.

It can be written as a sum of positive squares in only one way, i.e., 64336441 + 23532201 = 8021^2 + 4851^2 .

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 as a sum of consecutive naturals, namely, 21967159 + ... + 21967162.

Almost surely, 2^87868642 is an apocalyptic number.

87868642 is a deficient number, since it is larger than the sum of its proper divisors (43934324).

87868642 is a wasteful number, since it uses less digits than its factorization.

87868642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43934323.

The product of its digits is 1032192, while the sum is 49.

The square root of 87868642 is about 9373.8275000130. The cubic root of 87868642 is about 444.5745915565.

The spelling of 87868642 in words is "eighty-seven million, eight hundred sixty-eight thousand, six hundred forty-two".