87219261 has 24 divisors (see below), whose sum is σ = 131569984. Its totient is φ = 57736800.

The previous prime is 87219247. The next prime is 87219271. The reversal of 87219261 is 16291278.

It is not a de Polignac number, because 87219261 - 2¹⁵ = 87186493 is a prime.

It is a super-2 number, since 2×87219261² = 15214398978772242, 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 (87219221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35505 + ... + 37881.

Almost surely, 2^87219261 is an apocalyptic number.

87219261 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

87219261 is a deficient number, since it is larger than the sum of its proper divisors (44350723).

87219261 is a wasteful number, since it uses less digits than its factorization.

87219261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2543 (or 2531 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 87219261 is about 9339.1252802390. The cubic root of 87219261 is about 443.4766935442.

The spelling of 87219261 in words is "eighty-seven million, two hundred nineteen thousand, two hundred sixty-one".