87238669 has 6 divisors (see below), whose sum is σ = 101481774. Its totient is φ = 74775960.

The previous prime is 87238667. The next prime is 87238759. The reversal of 87238669 is 96683278.

It can be written as a sum of positive squares in only one way, i.e., 81540900 + 5697769 = 9030^2 + 2387^2 .

It is not a de Polignac number, because 87238669 - 2¹ = 87238667 is a prime.

It is a super-2 number, since 2×87238669² = 15221170737783122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 1780381 = 87238669 / (8 + 7 + 2 + 3 + 8 + 6 + 6 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87238663) 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 5 ways as a sum of consecutive naturals, for example, 890142 + ... + 890239.

It is an arithmetic number, because the mean of its divisors is an integer number (16913629).

Almost surely, 2^87238669 is an apocalyptic number.

It is an amenable number.

87238669 is a deficient number, since it is larger than the sum of its proper divisors (14243105).

87238669 is a wasteful number, since it uses less digits than its factorization.

87238669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1780395 (or 1780388 counting only the distinct ones).

The product of its digits is 870912, while the sum is 49.

The square root of 87238669 is about 9340.1642919169. The cubic root of 87238669 is about 443.5095851985.

The spelling of 87238669 in words is "eighty-seven million, two hundred thirty-eight thousand, six hundred sixty-nine".