161578560 has 336 divisors, whose sum is σ = 612940608. Its totient is φ = 35819520.

The previous prime is 161578559. The next prime is 161578577. The reversal of 161578560 is 65875161.

It is a super-2 number, since 2×161578560² = 52215262103347200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1510027 + ... + 1510133.

It is an arithmetic number, because the mean of its divisors is an integer number (1824228).

Almost surely, 2^161578560 is an apocalyptic number.

161578560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161578560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (306470304).

161578560 is an abundant number, since it is smaller than the sum of its proper divisors (451362048).

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

161578560 is a wasteful number, since it uses less digits than its factorization.

161578560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 39.

The square root of 161578560 is about 12711.3555532052. The cubic root of 161578560 is about 544.6630467744.

The spelling of 161578560 in words is "one hundred sixty-one million, five hundred seventy-eight thousand, five hundred sixty".