87172033 has 4 divisors (see below), whose sum is σ = 93877588. Its totient is φ = 80466480.

The previous prime is 87172013. The next prime is 87172061. The reversal of 87172033 is 33027178.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33027178 = 2 ⋅16513589.

It can be written as a sum of positive squares in 2 ways, for example, as 4870849 + 82301184 = 2207^2 + 9072^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87172033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87171986 and 87172004.

It is not an unprimeable number, because it can be changed into a prime (87172013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3352758 + ... + 3352783.

It is an arithmetic number, because the mean of its divisors is an integer number (23469397).

Almost surely, 2^87172033 is an apocalyptic number.

It is an amenable number.

87172033 is a deficient number, since it is larger than the sum of its proper divisors (6705555).

87172033 is a wasteful number, since it uses less digits than its factorization.

87172033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6705554.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 87172033 is about 9336.5964355326. The cubic root of 87172033 is about 443.3966336332.

The spelling of 87172033 in words is "eighty-seven million, one hundred seventy-two thousand, thirty-three".