87340813 has 4 divisors (see below), whose sum is σ = 99818080. Its totient is φ = 74863548.

The previous prime is 87340811. The next prime is 87340819. The reversal of 87340813 is 31804378.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31804378 = 2 ⋅15902189.

It is a cyclic number.

It is not a de Polignac number, because 87340813 - 2¹ = 87340811 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 (87340811) 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, 6238623 + ... + 6238636.

It is an arithmetic number, because the mean of its divisors is an integer number (24954520).

Almost surely, 2^87340813 is an apocalyptic number.

It is an amenable number.

87340813 is a deficient number, since it is larger than the sum of its proper divisors (12477267).

87340813 is a wasteful number, since it uses less digits than its factorization.

87340813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12477266.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 87340813 is about 9345.6306903280. The cubic root of 87340813 is about 443.6826131092.

The spelling of 87340813 in words is "eighty-seven million, three hundred forty thousand, eight hundred thirteen".