21627928 has 32 divisors (see below), whose sum is σ = 48787200. Its totient is φ = 8780832.

The previous prime is 21627923. The next prime is 21627937. The reversal of 21627928 is 82972612.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21627923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9100 + ... + 11227.

It is an arithmetic number, because the mean of its divisors is an integer number (1524600).

Almost surely, 2^21627928 is an apocalyptic number.

21627928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21627928 is an abundant number, since it is smaller than the sum of its proper divisors (27159272).

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

21627928 is a wasteful number, since it uses less digits than its factorization.

21627928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20359 (or 20355 counting only the distinct ones).

The product of its digits is 24192, while the sum is 37.

The square root of 21627928 is about 4650.5836192891. The cubic root of 21627928 is about 278.6153063723.

The spelling of 21627928 in words is "twenty-one million, six hundred twenty-seven thousand, nine hundred twenty-eight".