87428661 has 4 divisors (see below), whose sum is σ = 116571552. Its totient is φ = 58285772.

The previous prime is 87428647. The next prime is 87428683. The reversal of 87428661 is 16682478.

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 87428661 - 2⁵ = 87428629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87428261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14571441 + ... + 14571446.

It is an arithmetic number, because the mean of its divisors is an integer number (29142888).

Almost surely, 2^87428661 is an apocalyptic number.

It is an amenable number.

87428661 is a deficient number, since it is larger than the sum of its proper divisors (29142891).

87428661 is a wasteful number, since it uses less digits than its factorization.

87428661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29142890.

The product of its digits is 129024, while the sum is 42.

The square root of 87428661 is about 9350.3294594362. The cubic root of 87428661 is about 443.8313162889.

The spelling of 87428661 in words is "eighty-seven million, four hundred twenty-eight thousand, six hundred sixty-one".