87242237 has 4 divisors (see below), whose sum is σ = 90250620. Its totient is φ = 84233856.

The previous prime is 87242209. The next prime is 87242251. The reversal of 87242237 is 73224278.

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

It can be written as a sum of positive squares in 2 ways, for example, as 64336441 + 22905796 = 8021^2 + 4786^2 .

It is a cyclic number.

It is not a de Polignac number, because 87242237 - 2¹² = 87238141 is a prime.

It is a super-2 number, since 2×87242237² = 15222415833528338, 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 = 87242197 and 87242206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87242257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1504148 + ... + 1504205.

It is an arithmetic number, because the mean of its divisors is an integer number (22562655).

Almost surely, 2^87242237 is an apocalyptic number.

It is an amenable number.

87242237 is a deficient number, since it is larger than the sum of its proper divisors (3008383).

87242237 is a wasteful number, since it uses less digits than its factorization.

87242237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3008382.

The product of its digits is 37632, while the sum is 35.

The square root of 87242237 is about 9340.3552930282. The cubic root of 87242237 is about 443.5156315257.

The spelling of 87242237 in words is "eighty-seven million, two hundred forty-two thousand, two hundred thirty-seven".