87213239 has 8 divisors (see below), whose sum is σ = 88315920. Its totient is φ = 86116096.

The previous prime is 87213229. The next prime is 87213253. The reversal of 87213239 is 93231278.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87213239 - 2⁴ = 87213223 is a prime.

It is a super-2 number, since 2×87213239² = 15212298113742242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87213199 and 87213208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87213209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36617 + ... + 38925.

It is an arithmetic number, because the mean of its divisors is an integer number (11039490).

Almost surely, 2^87213239 is an apocalyptic number.

87213239 is a deficient number, since it is larger than the sum of its proper divisors (1102681).

87213239 is a wasteful number, since it uses less digits than its factorization.

87213239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2769.

The product of its digits is 18144, while the sum is 35.

The square root of 87213239 is about 9338.8028676057. The cubic root of 87213239 is about 443.4664867845.

The spelling of 87213239 in words is "eighty-seven million, two hundred thirteen thousand, two hundred thirty-nine".