72218257929 has 12 divisors (see below), whose sum is σ = 104318318832. Its totient is φ = 48144094200.

The previous prime is 72218257921. The next prime is 72218257963. The reversal of 72218257929 is 92975281227.

It is not a de Polignac number, because 72218257929 - 2³ = 72218257921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72218257921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 275814 + ... + 469584.

It is an arithmetic number, because the mean of its divisors is an integer number (8693193236).

Almost surely, 2^72218257929 is an apocalyptic number.

It is an amenable number.

72218257929 is a deficient number, since it is larger than the sum of its proper divisors (32100060903).

72218257929 is a wasteful number, since it uses less digits than its factorization.

72218257929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235188 (or 235185 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 54.

The spelling of 72218257929 in words is "seventy-two billion, two hundred eighteen million, two hundred fifty-seven thousand, nine hundred twenty-nine".