87423481 has 4 divisors (see below), whose sum is σ = 88324852. Its totient is φ = 86522112.

The previous prime is 87423463. The next prime is 87423491. The reversal of 87423481 is 18432478.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18432478 = 2 ⋅9216239.

It can be written as a sum of positive squares in 2 ways, for example, as 32959081 + 54464400 = 5741^2 + 7380^2 .

It is a cyclic number.

It is not a de Polignac number, because 87423481 - 2⁵ = 87423449 is a prime.

It is a super-2 number, since 2×87423481² = 15285730060314722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87423481.

It is not an unprimeable number, because it can be changed into a prime (87423461) 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, 450540 + ... + 450733.

It is an arithmetic number, because the mean of its divisors is an integer number (22081213).

Almost surely, 2^87423481 is an apocalyptic number.

It is an amenable number.

87423481 is a deficient number, since it is larger than the sum of its proper divisors (901371).

87423481 is an equidigital number, since it uses as much as digits as its factorization.

87423481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901370.

The product of its digits is 43008, while the sum is 37.

The square root of 87423481 is about 9350.0524597459. The cubic root of 87423481 is about 443.8225506980.

The spelling of 87423481 in words is "eighty-seven million, four hundred twenty-three thousand, four hundred eighty-one".