28636740 has 120 divisors (see below), whose sum is σ = 98062272. Its totient is φ = 6937920.

The previous prime is 28636733. The next prime is 28636747. The reversal of 28636740 is 4763682.

It is an interprime number because it is at equal distance from previous prime (28636733) and next prime (28636747).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28636695 and 28636704.

It is not an unprimeable number, because it can be changed into a prime (28636747) 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 39 ways as a sum of consecutive naturals, for example, 17017 + ... + 18623.

Almost surely, 2^28636740 is an apocalyptic number.

28636740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28636740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49031136).

28636740 is an abundant number, since it is smaller than the sum of its proper divisors (69425532).

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

28636740 is a wasteful number, since it uses less digits than its factorization.

28636740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1639 (or 1628 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 28636740 is about 5351.3306756357. The cubic root of 28636740 is about 305.9434728341.

The spelling of 28636740 in words is "twenty-eight million, six hundred thirty-six thousand, seven hundred forty".