72278081802 has 12 divisors (see below), whose sum is σ = 156602510610. Its totient is φ = 24092693928.

The previous prime is 72278081779. The next prime is 72278081803. The reversal of 72278081802 is 20818087227.

It can be written as a sum of positive squares in only one way, i.e., 59409675081 + 12868406721 = 243741^2 + 113439^2 .

It is a super-2 number, since 2×72278081802² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72278081803) by changing a digit.

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 in 5 ways as a sum of consecutive naturals, for example, 2007724477 + ... + 2007724512.

Almost surely, 2^72278081802 is an apocalyptic number.

72278081802 is an abundant number, since it is smaller than the sum of its proper divisors (84324428808).

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

72278081802 is a wasteful number, since it uses less digits than its factorization.

72278081802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4015448997 (or 4015448994 counting only the distinct ones).

The product of its (nonzero) digits is 200704, while the sum is 45.

The spelling of 72278081802 in words is "seventy-two billion, two hundred seventy-eight million, eighty-one thousand, eight hundred two".