72857229 has 8 divisors (see below), whose sum is σ = 102255840. Its totient is φ = 46015056.

The previous prime is 72857221. The next prime is 72857237. The reversal of 72857229 is 92275827.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (72857221) and next prime (72857237).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72857229 - 2³ = 72857221 is a prime.

It is a super-3 number, since 3×72857229³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72857221) 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, 639042 + ... + 639155.

It is an arithmetic number, because the mean of its divisors is an integer number (12781980).

Almost surely, 2^72857229 is an apocalyptic number.

It is an amenable number.

72857229 is a deficient number, since it is larger than the sum of its proper divisors (29398611).

72857229 is a wasteful number, since it uses less digits than its factorization.

72857229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278219.

The product of its digits is 141120, while the sum is 42.

The square root of 72857229 is about 8535.6446153762. The cubic root of 72857229 is about 417.6612813486.

The spelling of 72857229 in words is "seventy-two million, eight hundred fifty-seven thousand, two hundred twenty-nine".