87447729 has 4 divisors (see below), whose sum is σ = 116596976. Its totient is φ = 58298484.

The previous prime is 87447667. The next prime is 87447739. The reversal of 87447729 is 92774478.

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 not a de Polignac number, because 87447729 - 2¹¹ = 87445681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87447739) 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, 14574619 + ... + 14574624.

It is an arithmetic number, because the mean of its divisors is an integer number (29149244).

Almost surely, 2^87447729 is an apocalyptic number.

It is an amenable number.

87447729 is a deficient number, since it is larger than the sum of its proper divisors (29149247).

87447729 is a wasteful number, since it uses less digits than its factorization.

87447729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29149246.

The product of its digits is 790272, while the sum is 48.

The square root of 87447729 is about 9351.3490470627. The cubic root of 87447729 is about 443.8635801571.

The spelling of 87447729 in words is "eighty-seven million, four hundred forty-seven thousand, seven hundred twenty-nine".