161764572 has 48 divisors (see below), whose sum is σ = 393731072. Its totient is φ = 51632640.

The previous prime is 161764549. The next prime is 161764573. The reversal of 161764572 is 275467161.

It is a super-4 number, since 4×161764572⁴ (a number of 34 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161764572.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161764573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33843 + ... + 38325.

Almost surely, 2^161764572 is an apocalyptic number.

161764572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161764572 is an abundant number, since it is smaller than the sum of its proper divisors (231966500).

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

161764572 is a wasteful number, since it uses less digits than its factorization.

161764572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4618 (or 4616 counting only the distinct ones).

The product of its digits is 70560, while the sum is 39.

The square root of 161764572 is about 12718.6702135090. The cubic root of 161764572 is about 544.8719750906.

The spelling of 161764572 in words is "one hundred sixty-one million, seven hundred sixty-four thousand, five hundred seventy-two".