162121280 has 28 divisors (see below), whose sum is σ = 386052060. Its totient is φ = 64848384.

The previous prime is 162121229. The next prime is 162121291. The reversal of 162121280 is 82121261.

It can be written as a sum of positive squares in 2 ways, for example, as 110166016 + 51955264 = 10496^2 + 7208^2 .

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 3 ways as a sum of consecutive naturals, for example, 252995 + ... + 253634.

Almost surely, 2^162121280 is an apocalyptic number.

162121280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

162121280 is an abundant number, since it is smaller than the sum of its proper divisors (223930780).

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

162121280 is an equidigital number, since it uses as much as digits as its factorization.

162121280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506646 (or 506636 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 162121280 is about 12732.6854983542. The cubic root of 162121280 is about 545.2721811910.

The spelling of 162121280 in words is "one hundred sixty-two million, one hundred twenty-one thousand, two hundred eighty".