87821275 has 6 divisors (see below), whose sum is σ = 108898412. Its totient is φ = 70257000.

The previous prime is 87821243. The next prime is 87821299. The reversal of 87821275 is 57212878.

It is not a de Polignac number, because 87821275 - 2⁵ = 87821243 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1756401 + ... + 1756450.

Almost surely, 2^87821275 is an apocalyptic number.

87821275 is a deficient number, since it is larger than the sum of its proper divisors (21077137).

87821275 is a wasteful number, since it uses less digits than its factorization.

87821275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3512861 (or 3512856 counting only the distinct ones).

The product of its digits is 62720, while the sum is 40.

The square root of 87821275 is about 9371.3006034381. The cubic root of 87821275 is about 444.4946921777.

The spelling of 87821275 in words is "eighty-seven million, eight hundred twenty-one thousand, two hundred seventy-five".