72222840 has 80 divisors (see below), whose sum is σ = 242759880. Its totient is φ = 19258560.

The previous prime is 72222823. The next prime is 72222863. The reversal of 72222840 is 4822227.

It is a super-2 number, since 2×72222840² = 10432277235331200, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7906 + ... + 14385.

Almost surely, 2^72222840 is an apocalyptic number.

It is an amenable number.

72222840 is an abundant number, since it is smaller than the sum of its proper divisors (170537040).

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

72222840 is a wasteful number, since it uses less digits than its factorization.

72222840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22314 (or 22301 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 72222840 is about 8498.4022027673. The cubic root of 72222840 is about 416.4455132173.

The spelling of 72222840 in words is "seventy-two million, two hundred twenty-two thousand, eight hundred forty".