21628632 has 16 divisors (see below), whose sum is σ = 54071640. Its totient is φ = 7209536.

The previous prime is 21628627. The next prime is 21628643. The reversal of 21628632 is 23682612.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21628632.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 450573 + ... + 450620.

Almost surely, 2^21628632 is an apocalyptic number.

It is an amenable number.

21628632 is an abundant number, since it is smaller than the sum of its proper divisors (32443008).

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

21628632 is a wasteful number, since it uses less digits than its factorization.

21628632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901202 (or 901198 counting only the distinct ones).

The product of its digits is 6912, while the sum is 30.

The square root of 21628632 is about 4650.6593080982. The cubic root of 21628632 is about 278.6183293626.

The spelling of 21628632 in words is "twenty-one million, six hundred twenty-eight thousand, six hundred thirty-two".