161871078 has 32 divisors (see below), whose sum is σ = 335964384. Its totient is φ = 51950592.

The previous prime is 161871071. The next prime is 161871091. The reversal of 161871078 is 870178161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161871071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17776 + ... + 25292.

It is an arithmetic number, because the mean of its divisors is an integer number (10498887).

Almost surely, 2^161871078 is an apocalyptic number.

161871078 is an abundant number, since it is smaller than the sum of its proper divisors (174093306).

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

161871078 is a wasteful number, since it uses less digits than its factorization.

161871078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7656.

The product of its (nonzero) digits is 18816, while the sum is 39.

The square root of 161871078 is about 12722.8565188797. The cubic root of 161871078 is about 544.9915303232.

The spelling of 161871078 in words is "one hundred sixty-one million, eight hundred seventy-one thousand, seventy-eight".