72047155 has 12 divisors (see below), whose sum is σ = 90382320. Its totient is φ = 55129712.

The previous prime is 72047153. The next prime is 72047167. The reversal of 72047155 is 55174027.

It is not a de Polignac number, because 72047155 - 2¹ = 72047153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72047153) 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, 10975 + ... + 16264.

It is an arithmetic number, because the mean of its divisors is an integer number (7531860).

Almost surely, 2^72047155 is an apocalyptic number.

72047155 is a deficient number, since it is larger than the sum of its proper divisors (18335165).

72047155 is a wasteful number, since it uses less digits than its factorization.

72047155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27290 (or 27267 counting only the distinct ones).

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 72047155 is about 8488.0595544565. The cubic root of 72047155 is about 416.1075654874.

The spelling of 72047155 in words is "seventy-two million, forty-seven thousand, one hundred fifty-five".