163899720 has 256 divisors, whose sum is σ = 590976000. Its totient is φ = 40255488.

The previous prime is 163899707. The next prime is 163899761. The reversal of 163899720 is 27998361.

163899720 is a `hidden beast` number, since 1 + 638 + 9 + 9 + 7 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1450384 + ... + 1450496.

It is an arithmetic number, because the mean of its divisors is an integer number (2308500).

Almost surely, 2^163899720 is an apocalyptic number.

163899720 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 163899720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (295488000).

163899720 is an abundant number, since it is smaller than the sum of its proper divisors (427076280).

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

163899720 is a wasteful number, since it uses less digits than its factorization.

163899720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 163899720 is about 12802.3325999601. The cubic root of 163899720 is about 547.2587790814.

The spelling of 163899720 in words is "one hundred sixty-three million, eight hundred ninety-nine thousand, seven hundred twenty".