161878624 has 48 divisors (see below), whose sum is σ = 338830128. Its totient is φ = 75866112.

The previous prime is 161878603. The next prime is 161878637. The reversal of 161878624 is 426878161.

It is a Cunningham number, because it is equal to 545³-1.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182887 + ... + 183769.

It is an arithmetic number, because the mean of its divisors is an integer number (7058961).

Almost surely, 2^161878624 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161878624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169415064).

161878624 is an abundant number, since it is smaller than the sum of its proper divisors (176951504).

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

161878624 is a wasteful number, since it uses less digits than its factorization.

161878624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247 (or 1239 counting only the distinct ones).

The product of its digits is 129024, while the sum is 43.

The square root of 161878624 is about 12723.1530683239. The cubic root of 161878624 is about 544.9999988778. Note that the first 5 decimals are identical.

The spelling of 161878624 in words is "one hundred sixty-one million, eight hundred seventy-eight thousand, six hundred twenty-four".