161764272 has 60 divisors (see below), whose sum is σ = 453810240. Its totient is φ = 53791104.

The previous prime is 161764243. The next prime is 161764279. The reversal of 161764272 is 272467161.

161764272 is a `hidden beast` number, since 1 + 6 + 1 + 7 + 642 + 7 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (161764279) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72193 + ... + 74399.

It is an arithmetic number, because the mean of its divisors is an integer number (7563504).

Almost surely, 2^161764272 is an apocalyptic number.

161764272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161764272 is an abundant number, since it is smaller than the sum of its proper divisors (292045968).

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

161764272 is a wasteful number, since it uses less digits than its factorization.

161764272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2730 (or 2721 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 161764272 is about 12718.6584198177. The cubic root of 161764272 is about 544.8716382601.

The spelling of 161764272 in words is "one hundred sixty-one million, seven hundred sixty-four thousand, two hundred seventy-two".