87213526 has 4 divisors (see below), whose sum is σ = 130820292. Its totient is φ = 43606762.

The previous prime is 87213521. The next prime is 87213559. The reversal of 87213526 is 62531278.

It is a happy number.

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

It is a super-3 number, since 3×87213526³ (a number of 25 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 87213491 and 87213500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87213521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21803380 + ... + 21803383.

It is an arithmetic number, because the mean of its divisors is an integer number (32705073).

Almost surely, 2^87213526 is an apocalyptic number.

87213526 is a deficient number, since it is larger than the sum of its proper divisors (43606766).

87213526 is a wasteful number, since it uses less digits than its factorization.

87213526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43606765.

The product of its digits is 20160, while the sum is 34.

The square root of 87213526 is about 9338.8182335882. The cubic root of 87213526 is about 443.4669732349.

The spelling of 87213526 in words is "eighty-seven million, two hundred thirteen thousand, five hundred twenty-six".