72745546 has 8 divisors (see below), whose sum is σ = 109248804. Its totient is φ = 36329280.

The previous prime is 72745459. The next prime is 72745549. The reversal of 72745546 is 64554727.

It can be written as a sum of positive squares in 2 ways, for example, as 69906321 + 2839225 = 8361^2 + 1685^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 72745499 and 72745508.

It is not an unprimeable number, because it can be changed into a prime (72745549) 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, 19615 + ... + 23026.

Almost surely, 2^72745546 is an apocalyptic number.

72745546 is a deficient number, since it is larger than the sum of its proper divisors (36503258).

72745546 is a wasteful number, since it uses less digits than its factorization.

72745546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43496.

The product of its digits is 235200, while the sum is 40.

The square root of 72745546 is about 8529.0999525155. The cubic root of 72745546 is about 417.4477609230.

The spelling of 72745546 in words is "seventy-two million, seven hundred forty-five thousand, five hundred forty-six".