87840569 has 2 divisors, whose sum is σ = 87840570. Its totient is φ = 87840568.

The previous prime is 87840541. The next prime is 87840583. The reversal of 87840569 is 96504878.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49561600 + 38278969 = 7040^2 + 6187^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87840569 is a prime.

It is a super-3 number, since 3×87840569³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (87840539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43920284 + 43920285.

It is an arithmetic number, because the mean of its divisors is an integer number (43920285).

Almost surely, 2^87840569 is an apocalyptic number.

It is an amenable number.

87840569 is a deficient number, since it is larger than the sum of its proper divisors (1).

87840569 is an equidigital number, since it uses as much as digits as its factorization.

87840569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 47.

The square root of 87840569 is about 9372.3299664491. The cubic root of 87840569 is about 444.5272410585.

The spelling of 87840569 in words is "eighty-seven million, eight hundred forty thousand, five hundred sixty-nine".