72806738 has 4 divisors (see below), whose sum is σ = 109210110. Its totient is φ = 36403368.

The previous prime is 72806719. The next prime is 72806743. The reversal of 72806738 is 83760827.

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

It can be written as a sum of positive squares in only one way, i.e., 57259489 + 15547249 = 7567^2 + 3943^2 .

It is a junction number, because it is equal to n+sod(n) for n = 72806695 and 72806704.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 18201683 + ... + 18201686.

Almost surely, 2^72806738 is an apocalyptic number.

72806738 is a deficient number, since it is larger than the sum of its proper divisors (36403372).

72806738 is a wasteful number, since it uses less digits than its factorization.

72806738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36403371.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 72806738 is about 8532.6864468349. The cubic root of 72806738 is about 417.5647774995.

The spelling of 72806738 in words is "seventy-two million, eight hundred six thousand, seven hundred thirty-eight".