164312878 has 4 divisors (see below), whose sum is σ = 246469320. Its totient is φ = 82156438.

The previous prime is 164312861. The next prime is 164312881. The reversal of 164312878 is 878213461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 878213461 = 257 ⋅3417173.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 164312878.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41078218 + ... + 41078221.

It is an arithmetic number, because the mean of its divisors is an integer number (61617330).

Almost surely, 2^164312878 is an apocalyptic number.

164312878 is a deficient number, since it is larger than the sum of its proper divisors (82156442).

164312878 is an equidigital number, since it uses as much as digits as its factorization.

164312878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82156441.

The product of its digits is 64512, while the sum is 40.

The square root of 164312878 is about 12818.4584876654. The cubic root of 164312878 is about 547.7182360805.

The spelling of 164312878 in words is "one hundred sixty-four million, three hundred twelve thousand, eight hundred seventy-eight".