72361555 has 16 divisors (see below), whose sum is σ = 100868544. Its totient is φ = 48804480.

The previous prime is 72361511. The next prime is 72361559. The reversal of 72361555 is 55516327.

It is not a de Polignac number, because 72361555 - 2⁹ = 72361043 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72361555.

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 15 ways as a sum of consecutive naturals, for example, 14812 + ... + 19081.

It is an arithmetic number, because the mean of its divisors is an integer number (6304284).

Almost surely, 2^72361555 is an apocalyptic number.

72361555 is a deficient number, since it is larger than the sum of its proper divisors (28506989).

72361555 is a wasteful number, since it uses less digits than its factorization.

72361555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33966.

The product of its digits is 31500, while the sum is 34.

The square root of 72361555 is about 8506.5595277997. The cubic root of 72361555 is about 416.7119584544.

The spelling of 72361555 in words is "seventy-two million, three hundred sixty-one thousand, five hundred fifty-five".