28661558 has 8 divisors (see below), whose sum is σ = 45521352. Its totient is φ = 13487776.

The previous prime is 28661539. The next prime is 28661561. The reversal of 28661558 is 85516682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 421460 + ... + 421527.

It is an arithmetic number, because the mean of its divisors is an integer number (5690169).

Almost surely, 2^28661558 is an apocalyptic number.

28661558 is a deficient number, since it is larger than the sum of its proper divisors (16859794).

28661558 is a wasteful number, since it uses less digits than its factorization.

28661558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843006.

The product of its digits is 115200, while the sum is 41.

The square root of 28661558 is about 5353.6490359380. The cubic root of 28661558 is about 306.0318291752.

The spelling of 28661558 in words is "twenty-eight million, six hundred sixty-one thousand, five hundred fifty-eight".