72648773 has 2 divisors, whose sum is σ = 72648774. Its totient is φ = 72648772.

The previous prime is 72648749. The next prime is 72648781. The reversal of 72648773 is 37784627.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66308449 + 6340324 = 8143^2 + 2518^2 .

It is a cyclic number.

It is not a de Polignac number, because 72648773 - 2¹⁶ = 72583237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72648733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36324386 + 36324387.

It is an arithmetic number, because the mean of its divisors is an integer number (36324387).

Almost surely, 2^72648773 is an apocalyptic number.

It is an amenable number.

72648773 is a deficient number, since it is larger than the sum of its proper divisors (1).

72648773 is an equidigital number, since it uses as much as digits as its factorization.

72648773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 395136, while the sum is 44.

The square root of 72648773 is about 8523.4249571402. The cubic root of 72648773 is about 417.2625692916.

The spelling of 72648773 in words is "seventy-two million, six hundred forty-eight thousand, seven hundred seventy-three".