87644349 has 20 divisors (see below), whose sum is σ = 140998396. Its totient is φ = 53934336.

The previous prime is 87644339. The next prime is 87644353. The reversal of 87644349 is 94344678.

It can be written as a sum of positive squares in 2 ways, for example, as 55800900 + 31843449 = 7470^2 + 5643^2 .

It is a de Polignac number, because none of the positive numbers 2^k-87644349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87644309) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 40564 + ... + 42669.

Almost surely, 2^87644349 is an apocalyptic number.

It is an amenable number.

87644349 is a deficient number, since it is larger than the sum of its proper divisors (53354047).

87644349 is a wasteful number, since it uses less digits than its factorization.

87644349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83258 (or 83249 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 87644349 is about 9361.8560659732. The cubic root of 87644349 is about 444.1959963752.

The spelling of 87644349 in words is "eighty-seven million, six hundred forty-four thousand, three hundred forty-nine".