87705731 has 4 divisors (see below), whose sum is σ = 87858312. Its totient is φ = 87553152.

The previous prime is 87705719. The next prime is 87705749. The reversal of 87705731 is 13750778.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13750778 = 2 ⋅6875389.

It is a cyclic number.

It is not a de Polignac number, because 87705731 - 2¹⁴ = 87689347 is a prime.

It is a super-2 number, since 2×87705731² = 15384590500488722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87705701) 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 3 ways as a sum of consecutive naturals, for example, 75425 + ... + 76578.

It is an arithmetic number, because the mean of its divisors is an integer number (21964578).

Almost surely, 2^87705731 is an apocalyptic number.

87705731 is a deficient number, since it is larger than the sum of its proper divisors (152581).

87705731 is a wasteful number, since it uses less digits than its factorization.

87705731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152580.

The product of its (nonzero) digits is 41160, while the sum is 38.

The square root of 87705731 is about 9365.1337950934. The cubic root of 87705731 is about 444.2996702049.

The spelling of 87705731 in words is "eighty-seven million, seven hundred five thousand, seven hundred thirty-one".