161273700 has 432 divisors, whose sum is σ = 641208960. Its totient is φ = 34594560.

The previous prime is 161273689. The next prime is 161273701. The reversal of 161273700 is 7372161.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (161273701) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 3042874 + ... + 3042926.

It is an arithmetic number, because the mean of its divisors is an integer number (1484280).

Almost surely, 2^161273700 is an apocalyptic number.

161273700 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 161273700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (320604480).

161273700 is an abundant number, since it is smaller than the sum of its proper divisors (479935260).

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

161273700 is a wasteful number, since it uses less digits than its factorization.

161273700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113 (or 93 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 161273700 is about 12699.3582515023. The cubic root of 161273700 is about 544.3202815880.

The spelling of 161273700 in words is "one hundred sixty-one million, two hundred seventy-three thousand, seven hundred".