161798976 has 84 divisors (see below), whose sum is σ = 465998052. Its totient is φ = 53673984.

The previous prime is 161798971. The next prime is 161798993. The reversal of 161798976 is 679897161.

It can be written as a sum of positive squares in 2 ways, for example, as 159365376 + 2433600 = 12624^2 + 1560^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161798971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 147486 + ... + 148578.

Almost surely, 2^161798976 is an apocalyptic number.

161798976 is a gapful number since it is divisible by the number (16) 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 161798976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232999026).

161798976 is an abundant number, since it is smaller than the sum of its proper divisors (304199076).

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

161798976 is a wasteful number, since it uses less digits than its factorization.

161798976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368 (or 1355 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 54.

The square root of 161798976 is about 12720.0226414893. The cubic root of 161798976 is about 544.9106000429.

The spelling of 161798976 in words is "one hundred sixty-one million, seven hundred ninety-eight thousand, nine hundred seventy-six".