72021380 has 24 divisors (see below), whose sum is σ = 151744320. Its totient is φ = 28713440.

The previous prime is 72021373. The next prime is 72021473. The reversal of 72021380 is 8312027.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 431 + ... + 12009.

It is an arithmetic number, because the mean of its divisors is an integer number (6322680).

Almost surely, 2^72021380 is an apocalyptic number.

It is an amenable number.

72021380 is an abundant number, since it is smaller than the sum of its proper divisors (79722940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72021380 is a wasteful number, since it uses less digits than its factorization.

72021380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11899 (or 11897 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 72021380 is about 8486.5411093095. The cubic root of 72021380 is about 416.0579384909.

The spelling of 72021380 in words is "seventy-two million, twenty-one thousand, three hundred eighty".