73421563 has 4 divisors (see below), whose sum is σ = 73506160. Its totient is φ = 73336968.

The previous prime is 73421549. The next prime is 73421587. The reversal of 73421563 is 36512437.

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

It is a cyclic number.

It is not a de Polignac number, because 73421563 - 2¹³ = 73413371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73421503) 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 3 ways as a sum of consecutive naturals, for example, 40983 + ... + 42736.

It is an arithmetic number, because the mean of its divisors is an integer number (18376540).

Almost surely, 2^73421563 is an apocalyptic number.

73421563 is a deficient number, since it is larger than the sum of its proper divisors (84597).

73421563 is an equidigital number, since it uses as much as digits as its factorization.

73421563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84596.

The product of its digits is 15120, while the sum is 31.

The square root of 73421563 is about 8568.6383398998. The cubic root of 73421563 is about 418.7368758640.

It can be divided in two parts, 73421 and 563, that added together give a square (73984 = 272²).

The spelling of 73421563 in words is "seventy-three million, four hundred twenty-one thousand, five hundred sixty-three".