87594721 has 4 divisors (see below), whose sum is σ = 87626500. Its totient is φ = 87562944.

The previous prime is 87594713. The next prime is 87594757. The reversal of 87594721 is 12749578.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12749578 = 2 ⋅6374789.

It can be written as a sum of positive squares in 2 ways, for example, as 19713600 + 67881121 = 4440^2 + 8239^2 .

It is a cyclic number.

It is not a de Polignac number, because 87594721 - 2³ = 87594713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87534721) 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, 11316 + ... + 17413.

It is an arithmetic number, because the mean of its divisors is an integer number (21906625).

Almost surely, 2^87594721 is an apocalyptic number.

It is an amenable number.

87594721 is a deficient number, since it is larger than the sum of its proper divisors (31779).

87594721 is a wasteful number, since it uses less digits than its factorization.

87594721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31778.

The product of its digits is 141120, while the sum is 43.

The square root of 87594721 is about 9359.2051478745. The cubic root of 87594721 is about 444.1121395861.

The spelling of 87594721 in words is "eighty-seven million, five hundred ninety-four thousand, seven hundred twenty-one".