72145745 has 16 divisors (see below), whose sum is σ = 101618688. Its totient is φ = 48133440.

The previous prime is 72145729. The next prime is 72145747. The reversal of 72145745 is 54754127.

It is not a de Polignac number, because 72145745 - 2⁴ = 72145729 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72145747) 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 15 ways as a sum of consecutive naturals, for example, 26561 + ... + 29150.

It is an arithmetic number, because the mean of its divisors is an integer number (6351168).

Almost surely, 2^72145745 is an apocalyptic number.

It is an amenable number.

72145745 is a deficient number, since it is larger than the sum of its proper divisors (29472943).

72145745 is a wasteful number, since it uses less digits than its factorization.

72145745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55760.

The product of its digits is 39200, while the sum is 35.

The square root of 72145745 is about 8493.8651390283. The cubic root of 72145745 is about 416.2972808044.

The spelling of 72145745 in words is "seventy-two million, one hundred forty-five thousand, seven hundred forty-five".