28723577 has 4 divisors (see below), whose sum is σ = 29650176. Its totient is φ = 27796980.

The previous prime is 28723559. The next prime is 28723609. The reversal of 28723577 is 77532782.

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, and also an emirpimes, since its reverse is a distinct semiprime: 77532782 = 2 ⋅38766391.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28723577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28723537) 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, 463253 + ... + 463314.

It is an arithmetic number, because the mean of its divisors is an integer number (7412544).

Almost surely, 2^28723577 is an apocalyptic number.

It is an amenable number.

28723577 is a deficient number, since it is larger than the sum of its proper divisors (926599).

28723577 is an equidigital number, since it uses as much as digits as its factorization.

28723577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 926598.

The product of its digits is 164640, while the sum is 41.

The square root of 28723577 is about 5359.4381235350. The cubic root of 28723577 is about 306.2524047014.

The spelling of 28723577 in words is "twenty-eight million, seven hundred twenty-three thousand, five hundred seventy-seven".