87273553 has 4 divisors (see below), whose sum is σ = 87598260. Its totient is φ = 86948848.

The previous prime is 87273547. The next prime is 87273607. The reversal of 87273553 is 35537278.

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 50936769 + 36336784 = 7137^2 + 6028^2 .

It is a cyclic number.

It is not a de Polignac number, because 87273553 - 2²⁵ = 53719121 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87273253) 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, 161950 + ... + 162487.

It is an arithmetic number, because the mean of its divisors is an integer number (21899565).

Almost surely, 2^87273553 is an apocalyptic number.

It is an amenable number.

87273553 is a deficient number, since it is larger than the sum of its proper divisors (324707).

87273553 is a wasteful number, since it uses less digits than its factorization.

87273553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324706.

The product of its digits is 176400, while the sum is 40.

The square root of 87273553 is about 9342.0315242457. The cubic root of 87273553 is about 443.5686924989.

The spelling of 87273553 in words is "eighty-seven million, two hundred seventy-three thousand, five hundred fifty-three".