161067720 has 64 divisors (see below), whose sum is σ = 527135040. Its totient is φ = 39046400.

The previous prime is 161067701. The next prime is 161067727. The reversal of 161067720 is 27760161.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (161067727) 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, 59691 + ... + 62330.

It is an arithmetic number, because the mean of its divisors is an integer number (8236485).

Almost surely, 2^161067720 is an apocalyptic number.

161067720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161067720 is an abundant number, since it is smaller than the sum of its proper divisors (366067320).

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

161067720 is a wasteful number, since it uses less digits than its factorization.

161067720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122046 (or 122042 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 161067720 is about 12691.2458017328. The cubic root of 161067720 is about 544.0884461873.

The spelling of 161067720 in words is "one hundred sixty-one million, sixty-seven thousand, seven hundred twenty".