72021284 has 24 divisors (see below), whose sum is σ = 127646400. Its totient is φ = 35554464.

The previous prime is 72021283. The next prime is 72021331. The reversal of 72021284 is 48212027.

It is not an unprimeable number, because it can be changed into a prime (72021283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137447 + ... + 137969.

It is an arithmetic number, because the mean of its divisors is an integer number (5318600).

Almost surely, 2^72021284 is an apocalyptic number.

It is an amenable number.

72021284 is a deficient number, since it is larger than the sum of its proper divisors (55625116).

72021284 is a wasteful number, since it uses less digits than its factorization.

72021284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899 (or 897 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 72021284 is about 8486.5354532931. The cubic root of 72021284 is about 416.0577536311.

The spelling of 72021284 in words is "seventy-two million, twenty-one thousand, two hundred eighty-four".