107878321 has 4 divisors (see below), whose sum is σ = 108665892. Its totient is φ = 107090752.

The previous prime is 107878319. The next prime is 107878327. The reversal of 107878321 is 123878701.

107878321 = T₈₄₇₉ + T₈₄₈₀ + T₈₄₈₁.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 87628321 + 20250000 = 9361^2 + 4500^2 .

It is a cyclic number.

It is not a de Polignac number, because 107878321 - 2¹ = 107878319 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (107878327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 393580 + ... + 393853.

It is an arithmetic number, because the mean of its divisors is an integer number (27166473).

Almost surely, 2^107878321 is an apocalyptic number.

107878321 is the 8481-st centered triangular number.

It is an amenable number.

107878321 is a deficient number, since it is larger than the sum of its proper divisors (787571).

107878321 is an equidigital number, since it uses as much as digits as its factorization.

107878321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787570.

The product of its (nonzero) digits is 18816, while the sum is 37.

The square root of 107878321 is about 10386.4489119237. The cubic root of 107878321 is about 476.0414026671.

The spelling of 107878321 in words is "one hundred seven million, eight hundred seventy-eight thousand, three hundred twenty-one".