64749389 has 2 divisors, whose sum is σ = 64749390. Its totient is φ = 64749388.

The previous prime is 64749361. The next prime is 64749437. The reversal of 64749389 is 98394746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64673764 + 75625 = 8042^2 + 275^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64749389 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64749319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32374694 + 32374695.

It is an arithmetic number, because the mean of its divisors is an integer number (32374695).

Almost surely, 2^64749389 is an apocalyptic number.

It is an amenable number.

64749389 is a deficient number, since it is larger than the sum of its proper divisors (1).

64749389 is an equidigital number, since it uses as much as digits as its factorization.

64749389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 50.

The square root of 64749389 is about 8046.7005039333. The cubic root of 64749389 is about 401.5551728409. Note that the first 3 decimals are identical.

The spelling of 64749389 in words is "sixty-four million, seven hundred forty-nine thousand, three hundred eighty-nine".