161372220 has 24 divisors (see below), whose sum is σ = 451842384. Its totient is φ = 43032576.

The previous prime is 161372213. The next prime is 161372231. The reversal of 161372220 is 22273161.

161372220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1344709 + ... + 1344828.

It is an arithmetic number, because the mean of its divisors is an integer number (18826766).

Almost surely, 2^161372220 is an apocalyptic number.

161372220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161372220 is an abundant number, since it is smaller than the sum of its proper divisors (290470164).

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

161372220 is a wasteful number, since it uses less digits than its factorization.

161372220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2689549 (or 2689547 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 161372220 is about 12703.2365954508. The cubic root of 161372220 is about 544.4310984126.

The spelling of 161372220 in words is "one hundred sixty-one million, three hundred seventy-two thousand, two hundred twenty".