161279580 has 144 divisors (see below), whose sum is σ = 573181056. Its totient is φ = 33505920.

The previous prime is 161279549. The next prime is 161279593. The reversal of 161279580 is 85972161.

It is a super-2 number, since 2×161279580² = 52022205849952800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 29847 + ... + 34833.

It is an arithmetic number, because the mean of its divisors is an integer number (3980424).

Almost surely, 2^161279580 is an apocalyptic number.

161279580 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 161279580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (286590528).

161279580 is an abundant number, since it is smaller than the sum of its proper divisors (411901476).

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

161279580 is a wasteful number, since it uses less digits than its factorization.

161279580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5024 (or 5015 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 39.

The square root of 161279580 is about 12699.5897571536. The cubic root of 161279580 is about 544.3268967695.

The spelling of 161279580 in words is "one hundred sixty-one million, two hundred seventy-nine thousand, five hundred eighty".