64774921 has 2 divisors, whose sum is σ = 64774922. Its totient is φ = 64774920.

The previous prime is 64774907. The next prime is 64774937. The reversal of 64774921 is 12947746.

64774921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54464400 + 10310521 = 7380^2 + 3211^2 .

It is a cyclic number.

It is not a de Polignac number, because 64774921 - 2¹⁷ = 64643849 is a prime.

It is not a weakly prime, because it can be changed into another prime (64774121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32387460 + 32387461.

It is an arithmetic number, because the mean of its divisors is an integer number (32387461).

Almost surely, 2^64774921 is an apocalyptic number.

It is an amenable number.

64774921 is a deficient number, since it is larger than the sum of its proper divisors (1).

64774921 is an equidigital number, since it uses as much as digits as its factorization.

64774921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 40.

The square root of 64774921 is about 8048.2868363398. The cubic root of 64774921 is about 401.6079463601.

The spelling of 64774921 in words is "sixty-four million, seven hundred seventy-four thousand, nine hundred twenty-one".