21860748 has 72 divisors (see below), whose sum is σ = 68021408. Its totient is φ = 5764608.

The previous prime is 21860731. The next prime is 21860771. The reversal of 21860748 is 84706812.

21860748 is a `hidden beast` number, since 2 + 1 + 8 + 607 + 48 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61 + ... + 6612.

Almost surely, 2^21860748 is an apocalyptic number.

21860748 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21860748, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34010704).

21860748 is an abundant number, since it is smaller than the sum of its proper divisors (46160660).

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

21860748 is a wasteful number, since it uses less digits than its factorization.

21860748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6703 (or 6698 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 21860748 is about 4675.5478823342. The cubic root of 21860748 is about 279.6114849734.

The spelling of 21860748 in words is "twenty-one million, eight hundred sixty thousand, seven hundred forty-eight".