161537280 has 288 divisors, whose sum is σ = 565125120. Its totient is φ = 39198720.

The previous prime is 161537273. The next prime is 161537291. The reversal of 161537280 is 82735161.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2737891 + ... + 2737949.

It is an arithmetic number, because the mean of its divisors is an integer number (1962240).

Almost surely, 2^161537280 is an apocalyptic number.

161537280 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 161537280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (282562560).

161537280 is an abundant number, since it is smaller than the sum of its proper divisors (403587840).

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

161537280 is a wasteful number, since it uses less digits than its factorization.

161537280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 123 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 161537280 is about 12709.7317044853. The cubic root of 161537280 is about 544.6166594205.

The spelling of 161537280 in words is "one hundred sixty-one million, five hundred thirty-seven thousand, two hundred eighty".