87818651 has 4 divisors (see below), whose sum is σ = 92984472. Its totient is φ = 82652832.

The previous prime is 87818611. The next prime is 87818657. The reversal of 87818651 is 15681878.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 87818651 - 2⁶ = 87818587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87818657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2582885 + ... + 2582918.

It is an arithmetic number, because the mean of its divisors is an integer number (23246118).

Almost surely, 2^87818651 is an apocalyptic number.

87818651 is a deficient number, since it is larger than the sum of its proper divisors (5165821).

87818651 is a wasteful number, since it uses less digits than its factorization.

87818651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5165820.

The product of its digits is 107520, while the sum is 44.

The square root of 87818651 is about 9371.1606004806. The cubic root of 87818651 is about 444.4902651347.

The spelling of 87818651 in words is "eighty-seven million, eight hundred eighteen thousand, six hundred fifty-one".