87128633 has 4 divisors (see below), whose sum is σ = 87147648. Its totient is φ = 87109620.

The previous prime is 87128617. The next prime is 87128641. The reversal of 87128633 is 33682178.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 87128633 - 2⁴ = 87128617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87128653) 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, 2048 + ... + 13358.

It is an arithmetic number, because the mean of its divisors is an integer number (21786912).

Almost surely, 2^87128633 is an apocalyptic number.

It is an amenable number.

87128633 is a deficient number, since it is larger than the sum of its proper divisors (19015).

87128633 is a wasteful number, since it uses less digits than its factorization.

87128633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19014.

The product of its digits is 48384, while the sum is 38.

The square root of 87128633 is about 9334.2719587550. The cubic root of 87128633 is about 443.3230373674.

The spelling of 87128633 in words is "eighty-seven million, one hundred twenty-eight thousand, six hundred thirty-three".