87729449 has 4 divisors (see below), whose sum is σ = 87855300. Its totient is φ = 87603600.

The previous prime is 87729443. The next prime is 87729451. The reversal of 87729449 is 94492778.

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

It can be written as a sum of positive squares in 2 ways, for example, as 56145049 + 31584400 = 7493^2 + 5620^2 .

It is a cyclic number.

It is not a de Polignac number, because 87729449 - 2¹² = 87725353 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87729397 and 87729406.

It is not an unprimeable number, because it can be changed into a prime (87729443) 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, 61874 + ... + 63275.

It is an arithmetic number, because the mean of its divisors is an integer number (21963825).

Almost surely, 2^87729449 is an apocalyptic number.

It is an amenable number.

87729449 is a deficient number, since it is larger than the sum of its proper divisors (125851).

87729449 is a wasteful number, since it uses less digits than its factorization.

87729449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125850.

The product of its digits is 1016064, while the sum is 50.

The square root of 87729449 is about 9366.4000021353. The cubic root of 87729449 is about 444.3397168080.

The spelling of 87729449 in words is "eighty-seven million, seven hundred twenty-nine thousand, four hundred forty-nine".