161490428 has 12 divisors (see below), whose sum is σ = 308299992. Its totient is φ = 73404720.

The previous prime is 161490409. The next prime is 161490437. The reversal of 161490428 is 824094161.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1835075 + ... + 1835162.

It is an arithmetic number, because the mean of its divisors is an integer number (25691666).

Almost surely, 2^161490428 is an apocalyptic number.

It is an amenable number.

161490428 is a deficient number, since it is larger than the sum of its proper divisors (146809564).

161490428 is a wasteful number, since it uses less digits than its factorization.

161490428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3670252 (or 3670250 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 161490428 is about 12707.8884162555. Note that the first 3 decimals coincide. The cubic root of 161490428 is about 544.5640010970.

The spelling of 161490428 in words is "one hundred sixty-one million, four hundred ninety thousand, four hundred twenty-eight".