28032779 has 4 divisors (see below), whose sum is σ = 29681784. Its totient is φ = 26383776.

The previous prime is 28032769. The next prime is 28032793. The reversal of 28032779 is 97723082.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28032779 - 2⁸ = 28032523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28032769) 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, 824477 + ... + 824510.

It is an arithmetic number, because the mean of its divisors is an integer number (7420446).

Almost surely, 2^28032779 is an apocalyptic number.

28032779 is a deficient number, since it is larger than the sum of its proper divisors (1649005).

28032779 is a wasteful number, since it uses less digits than its factorization.

28032779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1649004.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 28032779 is about 5294.5990405318. The cubic root of 28032779 is about 303.7773466322. Note that the first 3 decimals are identical.

The spelling of 28032779 in words is "twenty-eight million, thirty-two thousand, seven hundred seventy-nine".