18628740 has 144 divisors (see below), whose sum is σ = 64209600. Its totient is φ = 4333824.

The previous prime is 18628733. The next prime is 18628763. The reversal of 18628740 is 4782681.

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 = 18628695 and 18628704.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 44251 + ... + 44669.

It is an arithmetic number, because the mean of its divisors is an integer number (445900).

Almost surely, 2^18628740 is an apocalyptic number.

18628740 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 18628740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32104800).

18628740 is an abundant number, since it is smaller than the sum of its proper divisors (45580860).

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

18628740 is a wasteful number, since it uses less digits than its factorization.

18628740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466 (or 461 counting only the distinct ones).

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

The square root of 18628740 is about 4316.1024084236. The cubic root of 18628740 is about 265.0907011227.

The spelling of 18628740 in words is "eighteen million, six hundred twenty-eight thousand, seven hundred forty".