28620577 has 4 divisors (see below), whose sum is σ = 28707376. Its totient is φ = 28533780.

The previous prime is 28620569. The next prime is 28620587. The reversal of 28620577 is 77502682.

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: 77502682 = 2 ⋅38751341.

It is a cyclic number.

It is not a de Polignac number, because 28620577 - 2³ = 28620569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28620547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42903 + ... + 43564.

It is an arithmetic number, because the mean of its divisors is an integer number (7176844).

Almost surely, 2^28620577 is an apocalyptic number.

It is an amenable number.

28620577 is a deficient number, since it is larger than the sum of its proper divisors (86799).

28620577 is an equidigital number, since it uses as much as digits as its factorization.

28620577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86798.

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 28620577 is about 5349.8202773551. The cubic root of 28620577 is about 305.8859023264.

The spelling of 28620577 in words is "twenty-eight million, six hundred twenty thousand, five hundred seventy-seven".