21782048 has 24 divisors (see below), whose sum is σ = 44044812. Its totient is φ = 10596096.

The previous prime is 21782039. The next prime is 21782051. The reversal of 21782048 is 84028712.

It can be written as a sum of positive squares in 2 ways, for example, as 17405584 + 4376464 = 4172^2 + 2092^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

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, 8015 + ... + 10382.

Almost surely, 2^21782048 is an apocalyptic number.

It is an amenable number.

21782048 is an abundant number, since it is smaller than the sum of its proper divisors (22262764).

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

21782048 is a wasteful number, since it uses less digits than its factorization.

21782048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18444 (or 18436 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 21782048 is about 4667.1241680504. The cubic root of 21782048 is about 279.2755421570.

It can be divided in two parts, 2178 and 2048, that multiplied together give a square (4460544 = 2112²).

The spelling of 21782048 in words is "twenty-one million, seven hundred eighty-two thousand, forty-eight".