28783577 has 4 divisors (see below), whose sum is σ = 28822656. Its totient is φ = 28744500.

The previous prime is 28783561. The next prime is 28783597. The reversal of 28783577 is 77538782.

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, and also an emirpimes, since its reverse is a distinct semiprime: 77538782 = 2 ⋅38769391.

It is a cyclic number.

It is not a de Polignac number, because 28783577 - 2⁴ = 28783561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28783597) 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, 18413 + ... + 19914.

It is an arithmetic number, because the mean of its divisors is an integer number (7205664).

Almost surely, 2^28783577 is an apocalyptic number.

It is an amenable number.

28783577 is a deficient number, since it is larger than the sum of its proper divisors (39079).

28783577 is an equidigital number, since it uses as much as digits as its factorization.

28783577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39078.

The product of its digits is 658560, while the sum is 47.

The square root of 28783577 is about 5365.0328051187. The cubic root of 28783577 is about 306.4654975280.

The spelling of 28783577 in words is "twenty-eight million, seven hundred eighty-three thousand, five hundred seventy-seven".