87021369 has 6 divisors (see below), whose sum is σ = 125697546. Its totient is φ = 58014240.

The previous prime is 87021359. The next prime is 87021377. The reversal of 87021369 is 96312078.

It can be written as a sum of positive squares in only one way, i.e., 86713344 + 308025 = 9312^2 + 555^2 .

It is not a de Polignac number, because 87021369 - 2⁴ = 87021353 is a prime.

It is a super-2 number, since 2×87021369² = 15145437325268322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87021359) 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 5 ways as a sum of consecutive naturals, for example, 4834512 + ... + 4834529.

It is an arithmetic number, because the mean of its divisors is an integer number (20949591).

Almost surely, 2^87021369 is an apocalyptic number.

It is an amenable number.

87021369 is a deficient number, since it is larger than the sum of its proper divisors (38676177).

87021369 is a wasteful number, since it uses less digits than its factorization.

87021369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9669047 (or 9669044 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 87021369 is about 9328.5244813958. The cubic root of 87021369 is about 443.1410377653.

The spelling of 87021369 in words is "eighty-seven million, twenty-one thousand, three hundred sixty-nine".