72778807 has 2 divisors, whose sum is σ = 72778808. Its totient is φ = 72778806.

The previous prime is 72778729. The next prime is 72778843. The reversal of 72778807 is 70887727.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72778807 - 2⁷ = 72778679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72778847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36389403 + 36389404.

It is an arithmetic number, because the mean of its divisors is an integer number (36389404).

Almost surely, 2^72778807 is an apocalyptic number.

72778807 is a deficient number, since it is larger than the sum of its proper divisors (1).

72778807 is an equidigital number, since it uses as much as digits as its factorization.

72778807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 307328, while the sum is 46.

The square root of 72778807 is about 8531.0495837265. The cubic root of 72778807 is about 417.5113735891.

The spelling of 72778807 in words is "seventy-two million, seven hundred seventy-eight thousand, eight hundred seven".