87172007 has 4 divisors (see below), whose sum is σ = 93877560. Its totient is φ = 80466456.

The previous prime is 87171979. The next prime is 87172009. The reversal of 87172007 is 70027178.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 87172007 - 2¹⁰ = 87170983 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 (87172009) 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, 3352757 + ... + 3352782.

It is an arithmetic number, because the mean of its divisors is an integer number (23469390).

Almost surely, 2^87172007 is an apocalyptic number.

87172007 is a deficient number, since it is larger than the sum of its proper divisors (6705553).

87172007 is a wasteful number, since it uses less digits than its factorization.

87172007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6705552.

The product of its (nonzero) digits is 5488, while the sum is 32.

The square root of 87172007 is about 9336.5950431621. The cubic root of 87172007 is about 443.3965895506.

The spelling of 87172007 in words is "eighty-seven million, one hundred seventy-two thousand, seven".