64421361 has 12 divisors (see below), whose sum is σ = 93133300. Its totient is φ = 42910560.

The previous prime is 64421359. The next prime is 64421389. The reversal of 64421361 is 16312446.

64421361 is a `hidden beast` number, since 644 + 2 + 13 + 6 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 22896225 + 41525136 = 4785^2 + 6444^2 .

It is not a de Polignac number, because 64421361 - 2¹ = 64421359 is a prime.

It is a super-2 number, since 2×64421361² = 8300223506184642, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64421311) 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 in 11 ways as a sum of consecutive naturals, for example, 11631 + ... + 16251.

Almost surely, 2^64421361 is an apocalyptic number.

It is an amenable number.

64421361 is a deficient number, since it is larger than the sum of its proper divisors (28711939).

64421361 is a wasteful number, since it uses less digits than its factorization.

64421361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6176 (or 6173 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 64421361 is about 8026.2918586356. The cubic root of 64421361 is about 400.8759159448.

The spelling of 64421361 in words is "sixty-four million, four hundred twenty-one thousand, three hundred sixty-one".