87297669 has 20 divisors (see below), whose sum is σ = 138080844. Its totient is φ = 54774144.

The previous prime is 87297619. The next prime is 87297677. The reversal of 87297669 is 96679278.

It can be written as a sum of positive squares in 2 ways, for example, as 50936769 + 36360900 = 7137^2 + 6030^2 .

It is not a de Polignac number, because 87297669 - 2⁹ = 87297157 is a prime.

It is a super-2 number, since 2×87297669² = 15241766025667122, 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 (87297619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 30322 + ... + 33075.

Almost surely, 2^87297669 is an apocalyptic number.

It is an amenable number.

87297669 is a deficient number, since it is larger than the sum of its proper divisors (50783175).

87297669 is a wasteful number, since it uses less digits than its factorization.

87297669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63426 (or 63417 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The square root of 87297669 is about 9343.3221607734. The cubic root of 87297669 is about 443.6095453387.

The spelling of 87297669 in words is "eighty-seven million, two hundred ninety-seven thousand, six hundred sixty-nine".