161455428 has 18 divisors (see below), whose sum is σ = 408123534. Its totient is φ = 53818464.

The previous prime is 161455379. The next prime is 161455429. The reversal of 161455428 is 824554161.

It is a happy number.

161455428 is a `hidden beast` number, since 161 + 455 + 42 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 159971904 + 1483524 = 12648^2 + 1218^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 4484873 = 161455428 / (1 + 6 + 1 + 4 + 5 + 5 + 4 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 161455392 and 161455401.

It is not an unprimeable number, because it can be changed into a prime (161455429) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2242401 + ... + 2242472.

Almost surely, 2^161455428 is an apocalyptic number.

161455428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

161455428 is an abundant number, since it is smaller than the sum of its proper divisors (246668106).

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

161455428 is a wasteful number, since it uses less digits than its factorization.

161455428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4484883 (or 4484878 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

The square root of 161455428 is about 12706.5112442401. The cubic root of 161455428 is about 544.5246569340.

The spelling of 161455428 in words is "one hundred sixty-one million, four hundred fifty-five thousand, four hundred twenty-eight".