72229228 has 6 divisors (see below), whose sum is σ = 126401156. Its totient is φ = 36114612.

The previous prime is 72229219. The next prime is 72229231. The reversal of 72229228 is 82292227.

It is a super-2 number, since 2×72229228² = 10434122754951968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72229193 and 72229202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9028650 + ... + 9028657.

Almost surely, 2^72229228 is an apocalyptic number.

It is an amenable number.

72229228 is a deficient number, since it is larger than the sum of its proper divisors (54171928).

72229228 is a wasteful number, since it uses less digits than its factorization.

72229228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18057311 (or 18057309 counting only the distinct ones).

The product of its digits is 16128, while the sum is 34.

The square root of 72229228 is about 8498.7780298111. The cubic root of 72229228 is about 416.4577908454.

The spelling of 72229228 in words is "seventy-two million, two hundred twenty-nine thousand, two hundred twenty-eight".