87213071 has 4 divisors (see below), whose sum is σ = 95141544. Its totient is φ = 79284600.

The previous prime is 87213053. The next prime is 87213131. The reversal of 87213071 is 17031278.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 87213071 - 2²⁶ = 20104207 is a prime.

It is a super-2 number, since 2×87213071² = 15212239506502082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87213011) 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, 3964220 + ... + 3964241.

It is an arithmetic number, because the mean of its divisors is an integer number (23785386).

Almost surely, 2^87213071 is an apocalyptic number.

87213071 is a deficient number, since it is larger than the sum of its proper divisors (7928473).

87213071 is a wasteful number, since it uses less digits than its factorization.

87213071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7928472.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 87213071 is about 9338.7938728724. The cubic root of 87213071 is about 443.4662020325.

The spelling of 87213071 in words is "eighty-seven million, two hundred thirteen thousand, seventy-one".