72281873 has 2 divisors, whose sum is σ = 72281874. Its totient is φ = 72281872.

The previous prime is 72281843. The next prime is 72281887. The reversal of 72281873 is 37818227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41899729 + 30382144 = 6473^2 + 5512^2 .

It is a cyclic number.

It is not a de Polignac number, because 72281873 - 2¹⁶ = 72216337 is a prime.

It is not a weakly prime, because it can be changed into another prime (72281843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36140936 + 36140937.

It is an arithmetic number, because the mean of its divisors is an integer number (36140937).

Almost surely, 2^72281873 is an apocalyptic number.

It is an amenable number.

72281873 is a deficient number, since it is larger than the sum of its proper divisors (1).

72281873 is an equidigital number, since it uses as much as digits as its factorization.

72281873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37632, while the sum is 38.

The square root of 72281873 is about 8501.8746756230. The cubic root of 72281873 is about 416.5589460912.

The spelling of 72281873 in words is "seventy-two million, two hundred eighty-one thousand, eight hundred seventy-three".