161287404 has 12 divisors (see below), whose sum is σ = 376337304. Its totient is φ = 53762464.

The previous prime is 161287397. The next prime is 161287421. The reversal of 161287404 is 404782161.

161287404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6720297 + ... + 6720320.

It is an arithmetic number, because the mean of its divisors is an integer number (31361442).

Almost surely, 2^161287404 is an apocalyptic number.

It is an amenable number.

161287404 is an abundant number, since it is smaller than the sum of its proper divisors (215049900).

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

161287404 is a wasteful number, since it uses less digits than its factorization.

161287404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13440624 (or 13440622 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 161287404 is about 12699.8977948643. The cubic root of 161287404 is about 544.3356987616.

It can be divided in two parts, 16128 and 7404, that added together give a palindrome (23532).

The spelling of 161287404 in words is "one hundred sixty-one million, two hundred eighty-seven thousand, four hundred four".