72221838 has 16 divisors (see below), whose sum is σ = 155554896. Its totient is φ = 22222080.

The previous prime is 72221837. The next prime is 72221873. The reversal of 72221838 is 83812227.

It is a junction number, because it is equal to n+sod(n) for n = 72221799 and 72221808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72221833) 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, 462883 + ... + 463038.

It is an arithmetic number, because the mean of its divisors is an integer number (9722181).

Almost surely, 2^72221838 is an apocalyptic number.

72221838 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

72221838 is an abundant number, since it is smaller than the sum of its proper divisors (83333058).

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

72221838 is a wasteful number, since it uses less digits than its factorization.

72221838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925939.

The product of its digits is 10752, while the sum is 33.

The square root of 72221838 is about 8498.3432503047. The cubic root of 72221838 is about 416.4435873245.

The spelling of 72221838 in words is "seventy-two million, two hundred twenty-one thousand, eight hundred thirty-eight".