161634280 has 32 divisors (see below), whose sum is σ = 364127400. Its totient is φ = 64573696.

The previous prime is 161634257. The next prime is 161634287. The reversal of 161634280 is 82436161.

It is a happy number.

161634280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 70660836 + 90973444 = 8406^2 + 9538^2 .

It is a super-2 number, since 2×161634280² = 52251280942236800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161634287) 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, 38526 + ... + 42514.

Almost surely, 2^161634280 is an apocalyptic number.

161634280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161634280 is an abundant number, since it is smaller than the sum of its proper divisors (202493120).

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

161634280 is a wasteful number, since it uses less digits than its factorization.

161634280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5013 (or 5009 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 161634280 is about 12713.5471053518. The cubic root of 161634280 is about 544.7256481845.

The spelling of 161634280 in words is "one hundred sixty-one million, six hundred thirty-four thousand, two hundred eighty".