28619557 has 2 divisors, whose sum is σ = 28619558. Its totient is φ = 28619556.

The previous prime is 28619531. The next prime is 28619573. The reversal of 28619557 is 75591682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24910081 + 3709476 = 4991^2 + 1926^2 .

It is a cyclic number.

It is not a de Polignac number, because 28619557 - 2²³ = 20230949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28619527) 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 as a sum of consecutive naturals, namely, 14309778 + 14309779.

It is an arithmetic number, because the mean of its divisors is an integer number (14309779).

Almost surely, 2^28619557 is an apocalyptic number.

It is an amenable number.

28619557 is a deficient number, since it is larger than the sum of its proper divisors (1).

28619557 is an equidigital number, since it uses as much as digits as its factorization.

28619557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 151200, while the sum is 43.

The square root of 28619557 is about 5349.7249462005. The cubic root of 28619557 is about 305.8822684918.

The spelling of 28619557 in words is "twenty-eight million, six hundred nineteen thousand, five hundred fifty-seven".