87370909 has 4 divisors (see below), whose sum is σ = 87464700. Its totient is φ = 87277120.

The previous prime is 87370903. The next prime is 87370937. The reversal of 87370909 is 90907378.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90907378 = 2 ⋅45453689.

It can be written as a sum of positive squares in 2 ways, for example, as 39967684 + 47403225 = 6322^2 + 6885^2 .

It is a cyclic number.

It is not a de Polignac number, because 87370909 - 2⁷ = 87370781 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 (87370903) 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, 45484 + ... + 47365.

It is an arithmetic number, because the mean of its divisors is an integer number (21866175).

Almost surely, 2^87370909 is an apocalyptic number.

It is an amenable number.

87370909 is a deficient number, since it is larger than the sum of its proper divisors (93791).

87370909 is an equidigital number, since it uses as much as digits as its factorization.

87370909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93790.

The product of its (nonzero) digits is 95256, while the sum is 43.

The square root of 87370909 is about 9347.2407158476. The cubic root of 87370909 is about 443.7335688156.

The spelling of 87370909 in words is "eighty-seven million, three hundred seventy thousand, nine hundred nine".