161787648 has 108 divisors (see below), whose sum is σ = 473566184. Its totient is φ = 48998400.

The previous prime is 161787611. The next prime is 161787653. The reversal of 161787648 is 846787161.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 161787597 and 161787606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 92058 + ... + 93798.

Almost surely, 2^161787648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161787648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (236783092).

161787648 is an abundant number, since it is smaller than the sum of its proper divisors (311778536).

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

161787648 is a wasteful number, since it uses less digits than its factorization.

161787648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1782 (or 1757 counting only the distinct ones).

The product of its digits is 451584, while the sum is 48.

The square root of 161787648 is about 12719.5773514689. The cubic root of 161787648 is about 544.8978828397.

The spelling of 161787648 in words is "one hundred sixty-one million, seven hundred eighty-seven thousand, six hundred forty-eight".