72204145 has 16 divisors (see below), whose sum is σ = 93863952. Its totient is φ = 53003520.

The previous prime is 72204109. The next prime is 72204149. The reversal of 72204145 is 54140227.

72204145 = 6008² + 6009².

It can be written as a sum of positive squares in 8 ways, for example, as 1442401 + 70761744 = 1201^2 + 8412^2 .

It is a de Polignac number, because none of the positive numbers 2^k-72204145 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72204149) 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, 8035 + ... + 14455.

It is an arithmetic number, because the mean of its divisors is an integer number (5866497).

Almost surely, 2^72204145 is an apocalyptic number.

72204145 is the 6009-th centered square number.

It is an amenable number.

72204145 is a deficient number, since it is larger than the sum of its proper divisors (21659807).

72204145 is a wasteful number, since it uses less digits than its factorization.

72204145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6612.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 72204145 is about 8497.3022189398. The cubic root of 72204145 is about 416.4095775829.

The spelling of 72204145 in words is "seventy-two million, two hundred four thousand, one hundred forty-five".