72021345 has 32 divisors (see below), whose sum is σ = 128646144. Its totient is φ = 34104000.

The previous prime is 72021331. The next prime is 72021347. The reversal of 72021345 is 54312027.

It is not a de Polignac number, because 72021345 - 2⁷ = 72021217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72021347) by changing a digit.

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 in 31 ways as a sum of consecutive naturals, for example, 2020 + ... + 12170.

It is an arithmetic number, because the mean of its divisors is an integer number (4020192).

Almost surely, 2^72021345 is an apocalyptic number.

It is an amenable number.

72021345 is a deficient number, since it is larger than the sum of its proper divisors (56624799).

72021345 is a wasteful number, since it uses less digits than its factorization.

72021345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10213.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 72021345 is about 8486.5390472206. The cubic root of 72021345 is about 416.0578710941.

The spelling of 72021345 in words is "seventy-two million, twenty-one thousand, three hundred forty-five".