28604661 has 8 divisors (see below), whose sum is σ = 39369984. Its totient is φ = 18454560.

The previous prime is 28604657. The next prime is 28604699. The reversal of 28604661 is 16640682.

It is a happy number.

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

It is not a de Polignac number, because 28604661 - 2² = 28604657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28604651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153696 + ... + 153881.

It is an arithmetic number, because the mean of its divisors is an integer number (4921248).

Almost surely, 2^28604661 is an apocalyptic number.

It is an amenable number.

28604661 is a deficient number, since it is larger than the sum of its proper divisors (10765323).

28604661 is a wasteful number, since it uses less digits than its factorization.

28604661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307611.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 28604661 is about 5348.3325438869. The cubic root of 28604661 is about 305.8291904164.

The spelling of 28604661 in words is "twenty-eight million, six hundred four thousand, six hundred sixty-one".