161989464 has 128 divisors (see below), whose sum is σ = 527869440. Its totient is φ = 40200192.

The previous prime is 161989463. The next prime is 161989469. The reversal of 161989464 is 464989161.

161989464 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161989463) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34947 + ... + 39309.

It is an arithmetic number, because the mean of its divisors is an integer number (4123980).

Almost surely, 2^161989464 is an apocalyptic number.

161989464 is a gapful number since it is divisible by the number (14) 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 161989464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263934720).

161989464 is an abundant number, since it is smaller than the sum of its proper divisors (365879976).

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

161989464 is a wasteful number, since it uses less digits than its factorization.

161989464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4409 (or 4405 counting only the distinct ones).

The product of its digits is 373248, while the sum is 48.

The square root of 161989464 is about 12727.5081614588. The cubic root of 161989464 is about 545.1243595795.

The spelling of 161989464 in words is "one hundred sixty-one million, nine hundred eighty-nine thousand, four hundred sixty-four".