18720628 has 12 divisors (see below), whose sum is σ = 32810400. Its totient is φ = 9346232.

The previous prime is 18720619. The next prime is 18720661. The reversal of 18720628 is 82602781.

It is a junction number, because it is equal to n+sod(n) for n = 18720593 and 18720602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178 + ... + 6121.

It is an arithmetic number, because the mean of its divisors is an integer number (2734200).

Almost surely, 2^18720628 is an apocalyptic number.

It is an amenable number.

18720628 is a deficient number, since it is larger than the sum of its proper divisors (14089772).

18720628 is a wasteful number, since it uses less digits than its factorization.

18720628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7046 (or 7044 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 18720628 is about 4326.7341032238. The cubic root of 18720628 is about 265.5258479852.

The spelling of 18720628 in words is "eighteen million, seven hundred twenty thousand, six hundred twenty-eight".