28550661 has 4 divisors (see below), whose sum is σ = 38067552. Its totient is φ = 19033772.

The previous prime is 28550657. The next prime is 28550677. The reversal of 28550661 is 16605582.

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 28550661 - 2² = 28550657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28550611) 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, 4758441 + ... + 4758446.

It is an arithmetic number, because the mean of its divisors is an integer number (9516888).

Almost surely, 2^28550661 is an apocalyptic number.

It is an amenable number.

28550661 is a deficient number, since it is larger than the sum of its proper divisors (9516891).

28550661 is an equidigital number, since it uses as much as digits as its factorization.

28550661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9516890.

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 28550661 is about 5343.2818566870. The cubic root of 28550661 is about 305.6366206412.

The spelling of 28550661 in words is "twenty-eight million, five hundred fifty thousand, six hundred sixty-one".