28064661 has 4 divisors (see below), whose sum is σ = 37419552. Its totient is φ = 18709772.

The previous prime is 28064651. The next prime is 28064689. The reversal of 28064661 is 16646082.

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 28064661 - 2²³ = 19676053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28064651) 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, 4677441 + ... + 4677446.

It is an arithmetic number, because the mean of its divisors is an integer number (9354888).

Almost surely, 2^28064661 is an apocalyptic number.

It is an amenable number.

28064661 is a deficient number, since it is larger than the sum of its proper divisors (9354891).

28064661 is an equidigital number, since it uses as much as digits as its factorization.

28064661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9354890.

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

The square root of 28064661 is about 5297.6089889685. The cubic root of 28064661 is about 303.8924661505.

The spelling of 28064661 in words is "twenty-eight million, sixty-four thousand, six hundred sixty-one".