201818628 has 120 divisors (see below), whose sum is σ = 609596064. Its totient is φ = 57542400.

The previous prime is 201818593. The next prime is 201818641. The reversal of 201818628 is 826818102.

201818628 is a `hidden beast` number, since 2 + 0 + 18 + 18 + 628 = 666.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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

It is a junction number, because it is equal to n+sod(n) for n = 201818592 and 201818601.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 58923 + ... + 62253.

Almost surely, 2^201818628 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201818628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (304798032).

201818628 is an abundant number, since it is smaller than the sum of its proper divisors (407777436).

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

201818628 is a wasteful number, since it uses less digits than its factorization.

201818628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3375 (or 3364 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 201818628 is about 14206.2883259492. The cubic root of 201818628 is about 586.5707687317.

The spelling of 201818628 in words is "two hundred one million, eight hundred eighteen thousand, six hundred twenty-eight".