72345047 has 4 divisors (see below), whose sum is σ = 76600656. Its totient is φ = 68089440.

The previous prime is 72345029. The next prime is 72345071. The reversal of 72345047 is 74054327.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72345047 - 2²⁶ = 5236183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72342047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2127779 + ... + 2127812.

It is an arithmetic number, because the mean of its divisors is an integer number (19150164).

Almost surely, 2^72345047 is an apocalyptic number.

72345047 is a deficient number, since it is larger than the sum of its proper divisors (4255609).

72345047 is a wasteful number, since it uses less digits than its factorization.

72345047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4255608.

The product of its (nonzero) digits is 23520, while the sum is 32.

The square root of 72345047 is about 8505.5891624273. The cubic root of 72345047 is about 416.6802675738.

The spelling of 72345047 in words is "seventy-two million, three hundred forty-five thousand, forty-seven".