50778649 has 2 divisors, whose sum is σ = 50778650. Its totient is φ = 50778648.

The previous prime is 50778551. The next prime is 50778671. The reversal of 50778649 is 94687705.

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., 39000025 + 11778624 = 6245^2 + 3432^2 .

It is a cyclic number.

It is not a de Polignac number, because 50778649 - 2¹⁵ = 50745881 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 50778599 and 50778608.

It is not a weakly prime, because it can be changed into another prime (50775649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25389324 + 25389325.

It is an arithmetic number, because the mean of its divisors is an integer number (25389325).

Almost surely, 2^50778649 is an apocalyptic number.

It is an amenable number.

50778649 is a deficient number, since it is larger than the sum of its proper divisors (1).

50778649 is an equidigital number, since it uses as much as digits as its factorization.

50778649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 423360, while the sum is 46.

The square root of 50778649 is about 7125.9139063000. The cubic root of 50778649 is about 370.3056860206.

The spelling of 50778649 in words is "fifty million, seven hundred seventy-eight thousand, six hundred forty-nine".