72563893 has 2 divisors, whose sum is σ = 72563894. Its totient is φ = 72563892.

The previous prime is 72563819. The next prime is 72563903. The reversal of 72563893 is 39836527.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72556324 + 7569 = 8518^2 + 87^2 .

It is a cyclic number.

It is not a de Polignac number, because 72563893 - 2²⁵ = 39009461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72563093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36281946 + 36281947.

It is an arithmetic number, because the mean of its divisors is an integer number (36281947).

Almost surely, 2^72563893 is an apocalyptic number.

It is an amenable number.

72563893 is a deficient number, since it is larger than the sum of its proper divisors (1).

72563893 is an equidigital number, since it uses as much as digits as its factorization.

72563893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 43.

The square root of 72563893 is about 8518.4442828488. Note that the first 3 decimals coincide. The cubic root of 72563893 is about 417.1000015117.

The spelling of 72563893 in words is "seventy-two million, five hundred sixty-three thousand, eight hundred ninety-three".