87047029 has 4 divisors (see below), whose sum is σ = 87125260. Its totient is φ = 86968800.

The previous prime is 87047017. The next prime is 87047033. The reversal of 87047029 is 92074078.

It is a happy number.

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 42224004 + 44823025 = 6498^2 + 6695^2 .

It is a cyclic number.

It is not a de Polignac number, because 87047029 - 2²⁵ = 53492597 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 (87047729) 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, 37422 + ... + 39679.

It is an arithmetic number, because the mean of its divisors is an integer number (21781315).

Almost surely, 2^87047029 is an apocalyptic number.

It is an amenable number.

87047029 is a deficient number, since it is larger than the sum of its proper divisors (78231).

87047029 is a wasteful number, since it uses less digits than its factorization.

87047029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78230.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 87047029 is about 9329.8997315084. The cubic root of 87047029 is about 443.1845898326.

The spelling of 87047029 in words is "eighty-seven million, forty-seven thousand, twenty-nine".