161628745 has 8 divisors (see below), whose sum is σ = 200642760. Its totient is φ = 124844160.

The previous prime is 161628737. The next prime is 161628749. The reversal of 161628745 is 547826161.

It can be written as a sum of positive squares in 4 ways, for example, as 6775609 + 154853136 = 2603^2 + 12444^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161628745 - 2³ = 161628737 is a prime.

It is a super-2 number, since 2×161628745² = 52247702420550050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161628698 and 161628707.

It is not an unprimeable number, because it can be changed into a prime (161628749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 557196 + ... + 557485.

It is an arithmetic number, because the mean of its divisors is an integer number (25080345).

Almost surely, 2^161628745 is an apocalyptic number.

It is an amenable number.

161628745 is a deficient number, since it is larger than the sum of its proper divisors (39014015).

161628745 is a wasteful number, since it uses less digits than its factorization.

161628745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1114715.

The product of its digits is 80640, while the sum is 40.

The square root of 161628745 is about 12713.3294223032. The cubic root of 161628745 is about 544.7194302566.

The spelling of 161628745 in words is "one hundred sixty-one million, six hundred twenty-eight thousand, seven hundred forty-five".