163788290 has 32 divisors (see below), whose sum is σ = 314810496. Its totient is φ = 61205760.

The previous prime is 163788263. The next prime is 163788301. The reversal of 163788290 is 92887361.

It is a super-2 number, since 2×163788290² = 53653207882248200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1610 + ... + 18170.

It is an arithmetic number, because the mean of its divisors is an integer number (9837828).

Almost surely, 2^163788290 is an apocalyptic number.

163788290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

163788290 is a deficient number, since it is larger than the sum of its proper divisors (151022206).

163788290 is a wasteful number, since it uses less digits than its factorization.

163788290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16634.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 163788290 is about 12797.9799187215. The cubic root of 163788290 is about 547.1347299155.

The spelling of 163788290 in words is "one hundred sixty-three million, seven hundred eighty-eight thousand, two hundred ninety".