161904744 has 40 divisors (see below), whose sum is σ = 453485010. Its totient is φ = 53968032.

The previous prime is 161904727. The next prime is 161904749. The reversal of 161904744 is 447409161.

161904744 is digitally balanced in base 3, 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 only one way, i.e., 94828644 + 67076100 = 9738^2 + 8190^2 .

It is a super-2 number, since 2×161904744² = 52426292259411072, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 161904699 and 161904708.

It is not an unprimeable number, because it can be changed into a prime (161904749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 124279 + ... + 125574.

Almost surely, 2^161904744 is an apocalyptic number.

It is an amenable number.

161904744 is an abundant number, since it is smaller than the sum of its proper divisors (291580266).

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

161904744 is a wasteful number, since it uses less digits than its factorization.

161904744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249871 (or 249858 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 161904744 is about 12724.1795020347. The cubic root of 161904744 is about 545.0293102100.

The spelling of 161904744 in words is "one hundred sixty-one million, nine hundred four thousand, seven hundred forty-four".