87644679 has 4 divisors (see below), whose sum is σ = 116859576. Its totient is φ = 58429784.

The previous prime is 87644659. The next prime is 87644681. The reversal of 87644679 is 97644678.

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 87644679 - 2¹⁶ = 87579143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87644659) 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 3 ways as a sum of consecutive naturals, for example, 14607444 + ... + 14607449.

It is an arithmetic number, because the mean of its divisors is an integer number (29214894).

Almost surely, 2^87644679 is an apocalyptic number.

87644679 is a deficient number, since it is larger than the sum of its proper divisors (29214897).

87644679 is a wasteful number, since it uses less digits than its factorization.

87644679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29214896.

The product of its digits is 2032128, while the sum is 51.

The square root of 87644679 is about 9361.8736906668. The cubic root of 87644679 is about 444.1965538726.

Subtracting 87644679 from its reverse (97644678), we obtain a palindrome (9999999).

The spelling of 87644679 in words is "eighty-seven million, six hundred forty-four thousand, six hundred seventy-nine".