73878321 has 16 divisors (see below), whose sum is σ = 107690688. Its totient is φ = 44678400.

The previous prime is 73878319. The next prime is 73878353. The reversal of 73878321 is 12387837.

It is not a de Polignac number, because 73878321 - 2¹ = 73878319 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 73878321.

It is not an unprimeable number, because it can be changed into a prime (73878121) 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 15 ways as a sum of consecutive naturals, for example, 15045 + ... + 19341.

It is an arithmetic number, because the mean of its divisors is an integer number (6730668).

Almost surely, 2^73878321 is an apocalyptic number.

It is an amenable number.

73878321 is a deficient number, since it is larger than the sum of its proper divisors (33812367).

73878321 is a wasteful number, since it uses less digits than its factorization.

73878321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4832.

The product of its digits is 56448, while the sum is 39.

The square root of 73878321 is about 8595.2499091068. The cubic root of 73878321 is about 419.6034068062.

The spelling of 73878321 in words is "seventy-three million, eight hundred seventy-eight thousand, three hundred twenty-one".