87130573 has 4 divisors (see below), whose sum is σ = 87149340. Its totient is φ = 87111808.

The previous prime is 87130543. The next prime is 87130609. The reversal of 87130573 is 37503178.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37503178 = 2 ⋅18751589.

It can be written as a sum of positive squares in 2 ways, for example, as 8311689 + 78818884 = 2883^2 + 8878^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87130573 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 (87130543) 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, 3261 + ... + 13597.

It is an arithmetic number, because the mean of its divisors is an integer number (21787335).

Almost surely, 2^87130573 is an apocalyptic number.

It is an amenable number.

87130573 is a deficient number, since it is larger than the sum of its proper divisors (18767).

87130573 is a wasteful number, since it uses less digits than its factorization.

87130573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18766.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 87130573 is about 9334.3758762972. The cubic root of 87130573 is about 443.3263276762.

The spelling of 87130573 in words is "eighty-seven million, one hundred thirty thousand, five hundred seventy-three".