87028929 has 12 divisors (see below), whose sum is σ = 135378516. Its totient is φ = 53556192.

The previous prime is 87028927. The next prime is 87028943. The reversal of 87028929 is 92982078.

It can be written as a sum of positive squares in 2 ways, for example, as 6890625 + 80138304 = 2625^2 + 8952^2 .

It is not a de Polignac number, because 87028929 - 2¹ = 87028927 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87028927) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 371802 + ... + 372035.

It is an arithmetic number, because the mean of its divisors is an integer number (11281543).

Almost surely, 2^87028929 is an apocalyptic number.

It is an amenable number.

87028929 is a deficient number, since it is larger than the sum of its proper divisors (48349587).

87028929 is a wasteful number, since it uses less digits than its factorization.

87028929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743856 (or 743853 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 87028929 is about 9328.9296813729. The cubic root of 87028929 is about 443.1538700511.

The spelling of 87028929 in words is "eighty-seven million, twenty-eight thousand, nine hundred twenty-nine".