72028305 has 16 divisors (see below), whose sum is σ = 128050560. Its totient is φ = 38415024.

The previous prime is 72028301. The next prime is 72028309. The reversal of 72028305 is 50382027.

It is an interprime number because it is at equal distance from previous prime (72028301) and next prime (72028309).

It is not a de Polignac number, because 72028305 - 2² = 72028301 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (72028301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 266637 + ... + 266906.

It is an arithmetic number, because the mean of its divisors is an integer number (8003160).

Almost surely, 2^72028305 is an apocalyptic number.

It is an amenable number.

72028305 is a deficient number, since it is larger than the sum of its proper divisors (56022255).

72028305 is a wasteful number, since it uses less digits than its factorization.

72028305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533557 (or 533551 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 72028305 is about 8486.9490984688. The cubic root of 72028305 is about 416.0712729983.

The spelling of 72028305 in words is "seventy-two million, twenty-eight thousand, three hundred five".