21628452 has 48 divisors (see below), whose sum is σ = 53125632. Its totient is φ = 6839040.

The previous prime is 21628447. The next prime is 21628459. The reversal of 21628452 is 25482612.

It is not an unprimeable number, because it can be changed into a prime (21628459) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19168 + ... + 20264.

It is an arithmetic number, because the mean of its divisors is an integer number (1106784).

Almost surely, 2^21628452 is an apocalyptic number.

It is an amenable number.

21628452 is an abundant number, since it is smaller than the sum of its proper divisors (31497180).

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

21628452 is a wasteful number, since it uses less digits than its factorization.

21628452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1188 (or 1186 counting only the distinct ones).

The product of its digits is 7680, while the sum is 30.

The square root of 21628452 is about 4650.6399559631. The cubic root of 21628452 is about 278.6175564452.

The spelling of 21628452 in words is "twenty-one million, six hundred twenty-eight thousand, four hundred fifty-two".