36778321 has 2 divisors, whose sum is σ = 36778322. Its totient is φ = 36778320.

The previous prime is 36778309. The next prime is 36778331. The reversal of 36778321 is 12387763.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19927296 + 16851025 = 4464^2 + 4105^2 .

It is an emirp because it is prime and its reverse (12387763) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 36778321 - 2⁵ = 36778289 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (36778331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18389160 + 18389161.

It is an arithmetic number, because the mean of its divisors is an integer number (18389161).

Almost surely, 2^36778321 is an apocalyptic number.

It is an amenable number.

36778321 is a deficient number, since it is larger than the sum of its proper divisors (1).

36778321 is an equidigital number, since it uses as much as digits as its factorization.

36778321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 37.

The square root of 36778321 is about 6064.5132533452. The cubic root of 36778321 is about 332.5553709584. Note that the first 3 decimals are identical.

The spelling of 36778321 in words is "thirty-six million, seven hundred seventy-eight thousand, three hundred twenty-one".