87539381 has 8 divisors (see below), whose sum is σ = 90966528. Its totient is φ = 84150000.

The previous prime is 87539369. The next prime is 87539401. The reversal of 87539381 is 18393578.

It is a happy number.

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 87539381 - 2¹⁸ = 87277237 is a prime.

It is a super-2 number, since 2×87539381² = 15326286451726322, 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 (87539581) 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, 4670 + ... + 14031.

It is an arithmetic number, because the mean of its divisors is an integer number (11370816).

Almost surely, 2^87539381 is an apocalyptic number.

It is an amenable number.

87539381 is a deficient number, since it is larger than the sum of its proper divisors (3427147).

87539381 is a wasteful number, since it uses less digits than its factorization.

87539381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18883.

The product of its digits is 181440, while the sum is 44.

The square root of 87539381 is about 9356.2482331328. The cubic root of 87539381 is about 444.0185938294.

The spelling of 87539381 in words is "eighty-seven million, five hundred thirty-nine thousand, three hundred eighty-one".