161077072 has 40 divisors (see below), whose sum is σ = 336931560. Its totient is φ = 74158080.

The previous prime is 161077019. The next prime is 161077109. The reversal of 161077072 is 270770161.

161077072 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 4426816 + 156650256 = 2104^2 + 12516^2 .

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, 117672 + ... + 119032.

It is an arithmetic number, because the mean of its divisors is an integer number (8423289).

Almost surely, 2^161077072 is an apocalyptic number.

It is an amenable number.

161077072 is an abundant number, since it is smaller than the sum of its proper divisors (175854488).

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

161077072 is a wasteful number, since it uses less digits than its factorization.

161077072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1951 (or 1945 counting only the distinct ones).

The product of its (nonzero) digits is 4116, while the sum is 31.

The square root of 161077072 is about 12691.6142393314. The cubic root of 161077072 is about 544.0989763681.

The spelling of 161077072 in words is "one hundred sixty-one million, seventy-seven thousand, seventy-two".