161273320 has 48 divisors (see below), whose sum is σ = 392941260. Its totient is φ = 59544576.

The previous prime is 161273317. The next prime is 161273389. The reversal of 161273320 is 23372161.

It can be written as a sum of positive squares in 6 ways, for example, as 338724 + 160934596 = 582^2 + 12686^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5169 + ... + 18688.

Almost surely, 2^161273320 is an apocalyptic number.

161273320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161273320 is an abundant number, since it is smaller than the sum of its proper divisors (231667940).

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

161273320 is a wasteful number, since it uses less digits than its factorization.

161273320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23894 (or 23877 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 161273320 is about 12699.3432901076. The cubic root of 161273320 is about 544.3198540708.

The spelling of 161273320 in words is "one hundred sixty-one million, two hundred seventy-three thousand, three hundred twenty".