161609800 has 48 divisors (see below), whose sum is σ = 409906800. Its totient is φ = 58766400.

The previous prime is 161609771. The next prime is 161609863. The reversal of 161609800 is 8906161.

It is a happy number.

It is a super-2 number, since 2×161609800² = 52235454912080000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34530 + ... + 38929.

It is an arithmetic number, because the mean of its divisors is an integer number (8539725).

Almost surely, 2^161609800 is an apocalyptic number.

161609800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161609800 is an abundant number, since it is smaller than the sum of its proper divisors (248297000).

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

161609800 is a wasteful number, since it uses less digits than its factorization.

161609800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73486 (or 73477 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 161609800 is about 12712.5843163379. The cubic root of 161609800 is about 544.6981466810.

It can be divided in two parts, 161609 and 800, that added together give a square (162409 = 403²).

The spelling of 161609800 in words is "one hundred sixty-one million, six hundred nine thousand, eight hundred".