72780245893 has 2 divisors, whose sum is σ = 72780245894. Its totient is φ = 72780245892.

The previous prime is 72780245873. The next prime is 72780246041. The reversal of 72780245893 is 39854208727.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71584607809 + 1195638084 = 267553^2 + 34578^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72780245893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72780245873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36390122946 + 36390122947.

It is an arithmetic number, because the mean of its divisors is an integer number (36390122947).

Almost surely, 2^72780245893 is an apocalyptic number.

It is an amenable number.

72780245893 is a deficient number, since it is larger than the sum of its proper divisors (1).

72780245893 is an equidigital number, since it uses as much as digits as its factorization.

72780245893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6773760, while the sum is 55.

The spelling of 72780245893 in words is "seventy-two billion, seven hundred eighty million, two hundred forty-five thousand, eight hundred ninety-three".