87644769 has 4 divisors (see below), whose sum is σ = 116859696. Its totient is φ = 58429844.

The previous prime is 87644761. The next prime is 87644771. The reversal of 87644769 is 96744678.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87644769 - 2³ = 87644761 is a prime.

It is a super-2 number, since 2×87644769² = 15363211066126722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87644761) 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, 14607459 + ... + 14607464.

It is an arithmetic number, because the mean of its divisors is an integer number (29214924).

Almost surely, 2^87644769 is an apocalyptic number.

It is an amenable number.

87644769 is a deficient number, since it is larger than the sum of its proper divisors (29214927).

87644769 is a wasteful number, since it uses less digits than its factorization.

87644769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29214926.

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

The square root of 87644769 is about 9361.8784973957. The cubic root of 87644769 is about 444.1967059171.

Subtracting 87644769 from its reverse (96744678), we obtain a palindrome (9099909).

The spelling of 87644769 in words is "eighty-seven million, six hundred forty-four thousand, seven hundred sixty-nine".