72776533 has 2 divisors, whose sum is σ = 72776534. Its totient is φ = 72776532.

The previous prime is 72776527. The next prime is 72776537. The reversal of 72776533 is 33567727.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71537764 + 1238769 = 8458^2 + 1113^2 .

It is an emirp because it is prime and its reverse (33567727) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72776533 - 2⁹ = 72776021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72776537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36388266 + 36388267.

It is an arithmetic number, because the mean of its divisors is an integer number (36388267).

Almost surely, 2^72776533 is an apocalyptic number.

It is an amenable number.

72776533 is a deficient number, since it is larger than the sum of its proper divisors (1).

72776533 is an equidigital number, since it uses as much as digits as its factorization.

72776533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 185220, while the sum is 40.

The square root of 72776533 is about 8530.9163048292. The cubic root of 72776533 is about 417.5070251128.

The spelling of 72776533 in words is "seventy-two million, seven hundred seventy-six thousand, five hundred thirty-three".