87445213 has 4 divisors (see below), whose sum is σ = 87837568. Its totient is φ = 87052860.

The previous prime is 87445181. The next prime is 87445217. The reversal of 87445213 is 31254478.

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: 31254478 = 2 ⋅15627239.

It is a cyclic number.

It is not a de Polignac number, because 87445213 - 2⁵ = 87445181 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 (87445217) 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, 195843 + ... + 196288.

It is an arithmetic number, because the mean of its divisors is an integer number (21959392).

Almost surely, 2^87445213 is an apocalyptic number.

It is an amenable number.

87445213 is a deficient number, since it is larger than the sum of its proper divisors (392355).

87445213 is a wasteful number, since it uses less digits than its factorization.

87445213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392354.

The product of its digits is 26880, while the sum is 34.

The square root of 87445213 is about 9351.2145200503. The cubic root of 87445213 is about 443.8593232465.

The spelling of 87445213 in words is "eighty-seven million, four hundred forty-five thousand, two hundred thirteen".