28010557 has 2 divisors, whose sum is σ = 28010558. Its totient is φ = 28010556.

The previous prime is 28010539. The next prime is 28010581. The reversal of 28010557 is 75501082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27994681 + 15876 = 5291^2 + 126^2 .

It is a cyclic number.

It is not a de Polignac number, because 28010557 - 2¹¹ = 28008509 is a prime.

It is a Chen prime.

It is the 5293-rd Hogben number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28010537) by changing a digit.

It is a nontrivial repunit in base 5292.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14005278 + 14005279.

It is an arithmetic number, because the mean of its divisors is an integer number (14005279).

Almost surely, 2^28010557 is an apocalyptic number.

It is an amenable number.

28010557 is a deficient number, since it is larger than the sum of its proper divisors (1).

28010557 is an equidigital number, since it uses as much as digits as its factorization.

28010557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 28010557 is about 5292.5000708550. The cubic root of 28010557 is about 303.6970558086.

The spelling of 28010557 in words is "twenty-eight million, ten thousand, five hundred fifty-seven".