87819261 has 12 divisors (see below), whose sum is σ = 118785216. Its totient is φ = 57711640.

The previous prime is 87819233. The next prime is 87819269. The reversal of 87819261 is 16291878.

It is not a de Polignac number, because 87819261 - 2⁹ = 87818749 is a prime.

It is a super-2 number, since 2×87819261² = 15424445205172242, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87819269) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12220 + ... + 18026.

It is an arithmetic number, because the mean of its divisors is an integer number (9898768).

Almost surely, 2^87819261 is an apocalyptic number.

It is an amenable number.

87819261 is a deficient number, since it is larger than the sum of its proper divisors (30965955).

87819261 is an equidigital number, since it uses as much as digits as its factorization.

87819261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5952 (or 5881 counting only the distinct ones).

The product of its digits is 48384, while the sum is 42.

The square root of 87819261 is about 9371.1931470864. The cubic root of 87819261 is about 444.4912942951.

The spelling of 87819261 in words is "eighty-seven million, eight hundred nineteen thousand, two hundred sixty-one".