87022381 has 4 divisors (see below), whose sum is σ = 87058972. Its totient is φ = 86985792.

The previous prime is 87022373. The next prime is 87022387. The reversal of 87022381 is 18322078.

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 49702500 + 37319881 = 7050^2 + 6109^2 .

It is a cyclic number.

It is not a de Polignac number, because 87022381 - 2³ = 87022373 is a prime.

It is a super-2 number, since 2×87022381² = 15145789589818322, 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 (87022387) 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, 14460 + ... + 19573.

It is an arithmetic number, because the mean of its divisors is an integer number (21764743).

Almost surely, 2^87022381 is an apocalyptic number.

It is an amenable number.

87022381 is a deficient number, since it is larger than the sum of its proper divisors (36591).

87022381 is a wasteful number, since it uses less digits than its factorization.

87022381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36590.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 87022381 is about 9328.5787234712. The cubic root of 87022381 is about 443.1427555694.

The spelling of 87022381 in words is "eighty-seven million, twenty-two thousand, three hundred eighty-one".