87173761 has 4 divisors (see below), whose sum is σ = 87202224. Its totient is φ = 87145300.

The previous prime is 87173759. The next prime is 87173783. The reversal of 87173761 is 16737178.

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: 16737178 = 2 ⋅8368589.

It is a cyclic number.

It is not a de Polignac number, because 87173761 - 2¹ = 87173759 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87173701) 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, 8995 + ... + 15976.

It is an arithmetic number, because the mean of its divisors is an integer number (21800556).

Almost surely, 2^87173761 is an apocalyptic number.

It is an amenable number.

87173761 is a deficient number, since it is larger than the sum of its proper divisors (28463).

87173761 is a wasteful number, since it uses less digits than its factorization.

87173761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28462.

The product of its digits is 49392, while the sum is 40.

The square root of 87173761 is about 9336.6889741492. The cubic root of 87173761 is about 443.3995634120.

The spelling of 87173761 in words is "eighty-seven million, one hundred seventy-three thousand, seven hundred sixty-one".