161269220 has 48 divisors (see below), whose sum is σ = 395297280. Its totient is φ = 54113664.

The previous prime is 161269219. The next prime is 161269231. The reversal of 161269220 is 22962161.

It is a happy number.

161269220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161269220² = 52015522638816800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5675 + ... + 18834.

It is an arithmetic number, because the mean of its divisors is an integer number (8235360).

Almost surely, 2^161269220 is an apocalyptic number.

161269220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161269220 is an abundant number, since it is smaller than the sum of its proper divisors (234028060).

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

161269220 is a wasteful number, since it uses less digits than its factorization.

161269220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24572 (or 24570 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 161269220 is about 12699.1818634115. The cubic root of 161269220 is about 544.3152413419.

The spelling of 161269220 in words is "one hundred sixty-one million, two hundred sixty-nine thousand, two hundred twenty".