64998749 has 2 divisors, whose sum is σ = 64998750. Its totient is φ = 64998748.

The previous prime is 64998743. The next prime is 64998793. The reversal of 64998749 is 94789946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64802500 + 196249 = 8050^2 + 443^2 .

It is a cyclic number.

It is not a de Polignac number, because 64998749 - 2¹⁶ = 64933213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64998694 and 64998703.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64998743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32499374 + 32499375.

It is an arithmetic number, because the mean of its divisors is an integer number (32499375).

Almost surely, 2^64998749 is an apocalyptic number.

It is an amenable number.

64998749 is a deficient number, since it is larger than the sum of its proper divisors (1).

64998749 is an equidigital number, since it uses as much as digits as its factorization.

64998749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3919104, while the sum is 56.

The square root of 64998749 is about 8062.1801641988. The cubic root of 64998749 is about 402.0699963921.

The spelling of 64998749 in words is "sixty-four million, nine hundred ninety-eight thousand, seven hundred forty-nine".