18063640 has 32 divisors (see below), whose sum is σ = 46450080. Its totient is φ = 6193152.

The previous prime is 18063601. The next prime is 18063653. The reversal of 18063640 is 4636081.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 18063599 and 18063608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31977 + ... + 32536.

It is an arithmetic number, because the mean of its divisors is an integer number (1451565).

Almost surely, 2^18063640 is an apocalyptic number.

18063640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18063640 is an abundant number, since it is smaller than the sum of its proper divisors (28386440).

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

18063640 is a wasteful number, since it uses less digits than its factorization.

18063640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64531 (or 64527 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 18063640 is about 4250.1341155309. The cubic root of 18063640 is about 262.3826353644.

The spelling of 18063640 in words is "eighteen million, sixty-three thousand, six hundred forty".