87689405 has 4 divisors (see below), whose sum is σ = 105227292. Its totient is φ = 70151520.

The previous prime is 87689387. The next prime is 87689423. The reversal of 87689405 is 50498678.

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

It is an interprime number because it is at equal distance from previous prime (87689387) and next prime (87689423).

It can be written as a sum of positive squares in 2 ways, for example, as 22629049 + 65060356 = 4757^2 + 8066^2 .

It is not a de Polignac number, because 87689405 - 2¹² = 87685309 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87689405.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 8768936 + ... + 8768945.

It is an arithmetic number, because the mean of its divisors is an integer number (26306823).

Almost surely, 2^87689405 is an apocalyptic number.

It is an amenable number.

87689405 is a deficient number, since it is larger than the sum of its proper divisors (17537887).

87689405 is a wasteful number, since it uses less digits than its factorization.

87689405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17537886.

The product of its (nonzero) digits is 483840, while the sum is 47.

The square root of 87689405 is about 9364.2621172199. The cubic root of 87689405 is about 444.2721004119.

The spelling of 87689405 in words is "eighty-seven million, six hundred eighty-nine thousand, four hundred five".