161677628 has 24 divisors (see below), whose sum is σ = 323697024. Its totient is φ = 69217200.

The previous prime is 161677619. The next prime is 161677657. The reversal of 161677628 is 826776161.

It is a super-2 number, since 2×161677628² = 52279310791412768, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30323 + ... + 35253.

It is an arithmetic number, because the mean of its divisors is an integer number (13487376).

Almost surely, 2^161677628 is an apocalyptic number.

It is an amenable number.

161677628 is an abundant number, since it is smaller than the sum of its proper divisors (162019396).

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

161677628 is a wasteful number, since it uses less digits than its factorization.

161677628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6113 (or 6111 counting only the distinct ones).

The product of its digits is 169344, while the sum is 44.

The square root of 161677628 is about 12715.2517867323. The cubic root of 161677628 is about 544.7743397055.

The spelling of 161677628 in words is "one hundred sixty-one million, six hundred seventy-seven thousand, six hundred twenty-eight".