87508381 has 4 divisors (see below), whose sum is σ = 90331264. Its totient is φ = 84685500.

The previous prime is 87508363. The next prime is 87508409. The reversal of 87508381 is 18380578.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87508381 - 2⁵ = 87508349 is a prime.

It is a super-2 number, since 2×87508381² = 15315433490482322, 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 (87508301) 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, 1411395 + ... + 1411456.

It is an arithmetic number, because the mean of its divisors is an integer number (22582816).

Almost surely, 2^87508381 is an apocalyptic number.

It is an amenable number.

87508381 is a deficient number, since it is larger than the sum of its proper divisors (2822883).

87508381 is a wasteful number, since it uses less digits than its factorization.

87508381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2822882.

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 87508381 is about 9354.5914395018. The cubic root of 87508381 is about 443.9661747491.

The spelling of 87508381 in words is "eighty-seven million, five hundred eight thousand, three hundred eighty-one".