87749 has 4 divisors (see below), whose sum is σ = 89664. Its totient is φ = 85836.

The previous prime is 87743. The next prime is 87751. The reversal of 87749 is 94778.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94778 = 2 ⋅47389.

It is a cyclic number.

It is not a de Polignac number, because 87749 - 2¹² = 83653 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 887 + ... + 980.

It is an arithmetic number, because the mean of its divisors is an integer number (22416).

2⁸⁷⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

87749 is a deficient number, since it is larger than the sum of its proper divisors (1915).

87749 is a wasteful number, since it uses less digits than its factorization.

87749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1914.

The product of its digits is 14112, while the sum is 35.

The square root of 87749 is about 296.2245769682. The cubic root of 87749 is about 44.4372722223.

Subtracting from 87749 its product of digits (14112), we obtain a palindrome (73637).

The spelling of 87749 in words is "eighty-seven thousand, seven hundred forty-nine".