16620000 has 120 divisors (see below), whose sum is σ = 54713736. Its totient is φ = 4416000.

The previous prime is 16619959. The next prime is 16620001. The reversal of 16620000 is 2661.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16620001) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 59862 + ... + 60138.

Almost surely, 2^16620000 is an apocalyptic number.

16620000 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 16620000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27356868).

16620000 is an abundant number, since it is smaller than the sum of its proper divisors (38093736).

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

16620000 is an equidigital number, since it uses as much as digits as its factorization.

16620000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310 (or 287 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 16620000 is about 4076.7634221279. The cubic root of 16620000 is about 255.1978472252.

Adding to 16620000 its reverse (2661), we get a palindrome (16622661).

The spelling of 16620000 in words is "sixteen million, six hundred twenty thousand".