164781378 has 40 divisors (see below), whose sum is σ = 378253260. Its totient is φ = 53585280.

The previous prime is 164781377. The next prime is 164781403. The reversal of 164781378 is 873187461.

It can be written as a sum of positive squares in 2 ways, for example, as 164019249 + 762129 = 12807^2 + 873^2 .

It is not an unprimeable number, because it can be changed into a prime (164781371) 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 19 ways as a sum of consecutive naturals, for example, 5763 + ... + 19046.

Almost surely, 2^164781378 is an apocalyptic number.

164781378 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

164781378 is an abundant number, since it is smaller than the sum of its proper divisors (213471882).

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

164781378 is a wasteful number, since it uses less digits than its factorization.

164781378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24864 (or 24855 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 164781378 is about 12836.7199081385. The cubic root of 164781378 is about 548.2383058769.

The spelling of 164781378 in words is "one hundred sixty-four million, seven hundred eighty-one thousand, three hundred seventy-eight".