72728450 has 12 divisors (see below), whose sum is σ = 135275010. Its totient is φ = 29091360.

The previous prime is 72728419. The next prime is 72728471. The reversal of 72728450 is 5482727.

It can be written as a sum of positive squares in 3 ways, for example, as 61512649 + 11215801 = 7843^2 + 3349^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 72728450.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 727235 + ... + 727334.

Almost surely, 2^72728450 is an apocalyptic number.

72728450 is a deficient number, since it is larger than the sum of its proper divisors (62546560).

72728450 is a wasteful number, since it uses less digits than its factorization.

72728450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1454581 (or 1454576 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 35.

The square root of 72728450 is about 8528.0976776770. The cubic root of 72728450 is about 417.4150567624.

The spelling of 72728450 in words is "seventy-two million, seven hundred twenty-eight thousand, four hundred fifty".