87639029 has 4 divisors (see below), whose sum is σ = 92794284. Its totient is φ = 82483776.

The previous prime is 87639023. The next prime is 87639049. The reversal of 87639029 is 92093678.

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 50794129 + 36844900 = 7127^2 + 6070^2 .

It is a cyclic number.

It is not a de Polignac number, because 87639029 - 2¹² = 87634933 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 (87639023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2577602 + ... + 2577635.

It is an arithmetic number, because the mean of its divisors is an integer number (23198571).

Almost surely, 2^87639029 is an apocalyptic number.

It is an amenable number.

87639029 is a deficient number, since it is larger than the sum of its proper divisors (5155255).

87639029 is a wasteful number, since it uses less digits than its factorization.

87639029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5155254.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 87639029 is about 9361.5719299699. The cubic root of 87639029 is about 444.1870086479.

The spelling of 87639029 in words is "eighty-seven million, six hundred thirty-nine thousand, twenty-nine".