16478820 has 72 divisors (see below), whose sum is σ = 50633856. Its totient is φ = 4337472.

The previous prime is 16478789. The next prime is 16478827. The reversal of 16478820 is 2887461.

16478820 is a `hidden beast` number, since 1 + 647 + 8 + 8 + 2 + 0 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (16478827) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14389 + ... + 15491.

It is an arithmetic number, because the mean of its divisors is an integer number (703248).

Almost surely, 2^16478820 is an apocalyptic number.

16478820 is a gapful number since it is divisible by the number (10) 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 16478820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25316928).

16478820 is an abundant number, since it is smaller than the sum of its proper divisors (34155036).

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

16478820 is a wasteful number, since it uses less digits than its factorization.

16478820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1201 (or 1196 counting only the distinct ones).

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

The square root of 16478820 is about 4059.4112873667. The cubic root of 16478820 is about 254.4731915311.

The spelling of 16478820 in words is "sixteen million, four hundred seventy-eight thousand, eight hundred twenty".