28636530 has 64 divisors (see below), whose sum is σ = 74850048. Its totient is φ = 6969600.

The previous prime is 28636507. The next prime is 28636561. The reversal of 28636530 is 3563682.

28636530 = T₁₅₆ + T₁₅₇ + ... + T₅₅₉.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28636491 and 28636500.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39027 + ... + 39753.

It is an arithmetic number, because the mean of its divisors is an integer number (1169532).

Almost surely, 2^28636530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28636530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37425024).

28636530 is an abundant number, since it is smaller than the sum of its proper divisors (46213518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28636530 is a wasteful number, since it uses less digits than its factorization.

28636530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 28636530 is about 5351.3110543118. The cubic root of 28636530 is about 305.9427249803.

The spelling of 28636530 in words is "twenty-eight million, six hundred thirty-six thousand, five hundred thirty".