72021835 has 16 divisors (see below), whose sum is σ = 89920512. Its totient is φ = 55317600.

The previous prime is 72021811. The next prime is 72021841. The reversal of 72021835 is 53812027.

It is a de Polignac number, because none of the positive numbers 2^k-72021835 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18532 + ... + 22078.

It is an arithmetic number, because the mean of its divisors is an integer number (5620032).

Almost surely, 2^72021835 is an apocalyptic number.

72021835 is a deficient number, since it is larger than the sum of its proper divisors (17898677).

72021835 is a wasteful number, since it uses less digits than its factorization.

72021835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3714.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 72021835 is about 8486.5679164195. The cubic root of 72021835 is about 416.0588146472.

The spelling of 72021835 in words is "seventy-two million, twenty-one thousand, eight hundred thirty-five".