73278673 has 4 divisors (see below), whose sum is σ = 78915508. Its totient is φ = 67641840.

The previous prime is 73278659. The next prime is 73278677. The reversal of 73278673 is 37687237.

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 43335889 + 29942784 = 6583^2 + 5472^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73278673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73278677) 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, 2818398 + ... + 2818423.

It is an arithmetic number, because the mean of its divisors is an integer number (19728877).

Almost surely, 2^73278673 is an apocalyptic number.

It is an amenable number.

73278673 is a deficient number, since it is larger than the sum of its proper divisors (5636835).

73278673 is a wasteful number, since it uses less digits than its factorization.

73278673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5636834.

The product of its digits is 296352, while the sum is 43.

The square root of 73278673 is about 8560.2963149648. The cubic root of 73278673 is about 418.4650566745.

The spelling of 73278673 in words is "seventy-three million, two hundred seventy-eight thousand, six hundred seventy-three".