72361556 has 12 divisors (see below), whose sum is σ = 129721620. Its totient is φ = 35298240.

The previous prime is 72361511. The next prime is 72361559. The reversal of 72361556 is 65516327.

It can be written as a sum of positive squares in 2 ways, for example, as 2371600 + 69989956 = 1540^2 + 8366^2 .

It is a super-2 number, since 2×72361556² = 10472389573482272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72361559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220451 + ... + 220778.

It is an arithmetic number, because the mean of its divisors is an integer number (10810135).

Almost surely, 2^72361556 is an apocalyptic number.

It is an amenable number.

72361556 is a deficient number, since it is larger than the sum of its proper divisors (57360064).

72361556 is a wasteful number, since it uses less digits than its factorization.

72361556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441274 (or 441272 counting only the distinct ones).

The product of its digits is 37800, while the sum is 35.

The square root of 72361556 is about 8506.5595865779. The cubic root of 72361556 is about 416.7119603740.

The spelling of 72361556 in words is "seventy-two million, three hundred sixty-one thousand, five hundred fifty-six".