72276780402 has 18 divisors (see below), whose sum is σ = 156602162223. Its totient is φ = 24091879932.

The previous prime is 72276780397. The next prime is 72276780419. The reversal of 72276780402 is 20408767227.

It can be written as a sum of positive squares in only one way, i.e., 36138390201 + 36138390201 = 190101^2 + 190101^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=190101.

It is an unprimeable number.

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 8 ways as a sum of consecutive naturals, for example, 1108923 + ... + 1172289.

Almost surely, 2^72276780402 is an apocalyptic number.

72276780402 is an abundant number, since it is smaller than the sum of its proper divisors (84325381821).

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

72276780402 is an frugal number, since it uses more digits than its factorization.

72276780402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126742 (or 63372 counting only the distinct ones).

The product of its (nonzero) digits is 526848, while the sum is 45.

The spelling of 72276780402 in words is "seventy-two billion, two hundred seventy-six million, seven hundred eighty thousand, four hundred two".