28636620 has 24 divisors (see below), whose sum is σ = 80182704. Its totient is φ = 7636416.

The previous prime is 28636603. The next prime is 28636627. The reversal of 28636620 is 2663682.

It is not an unprimeable number, because it can be changed into a prime (28636627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238579 + ... + 238698.

It is an arithmetic number, because the mean of its divisors is an integer number (3340946).

Almost surely, 2^28636620 is an apocalyptic number.

28636620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28636620 is an abundant number, since it is smaller than the sum of its proper divisors (51546084).

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

28636620 is a wasteful number, since it uses less digits than its factorization.

28636620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477289 (or 477287 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 28636620 is about 5351.3194634595. The cubic root of 28636620 is about 305.9430454895.

The spelling of 28636620 in words is "twenty-eight million, six hundred thirty-six thousand, six hundred twenty".