28630057 has 8 divisors (see below), whose sum is σ = 30436776. Its totient is φ = 26836992.

The previous prime is 28630051. The next prime is 28630061. The reversal of 28630057 is 75003682.

It can be written as a sum of positive squares in 4 ways, for example, as 14409616 + 14220441 = 3796^2 + 3771^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 5-Lehmer number, since φ(28630057) divides (28630057-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 28630057 - 2¹¹ = 28628009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28630051) 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 7 ways as a sum of consecutive naturals, for example, 1093 + ... + 7645.

It is an arithmetic number, because the mean of its divisors is an integer number (3804597).

Almost surely, 2^28630057 is an apocalyptic number.

28630057 is the 4369-th pentagonal number.

It is an amenable number.

28630057 is a deficient number, since it is larger than the sum of its proper divisors (1806719).

28630057 is a wasteful number, since it uses less digits than its factorization.

28630057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6827.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 28630057 is about 5350.7062150711. The cubic root of 28630057 is about 305.9196714831.

The spelling of 28630057 in words is "twenty-eight million, six hundred thirty thousand, fifty-seven".