18672816 has 40 divisors (see below), whose sum is σ = 48908080. Its totient is φ = 6139008.

The previous prime is 18672809. The next prime is 18672859. The reversal of 18672816 is 61827681.

18672816 = T₄₃₁ + T₄₃₂ + ... + T₅₇₆.

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, 255756 + ... + 255828.

It is an arithmetic number, because the mean of its divisors is an integer number (1222702).

Almost surely, 2^18672816 is an apocalyptic number.

18672816 is a gapful number since it is divisible by the number (16) 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 18672816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24454040).

18672816 is an abundant number, since it is smaller than the sum of its proper divisors (30235264).

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

18672816 is an frugal number, since it uses more digits than its factorization.

18672816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230 (or 78 counting only the distinct ones).

The product of its digits is 32256, while the sum is 39.

The square root of 18672816 is about 4321.2053873890. The cubic root of 18672816 is about 265.2996065535.

The spelling of 18672816 in words is "eighteen million, six hundred seventy-two thousand, eight hundred sixteen".