64361421 has 12 divisors (see below), whose sum is σ = 93036060. Its totient is φ = 42875520.

The previous prime is 64361413. The next prime is 64361459. The reversal of 64361421 is 12416346.

64361421 is a `hidden beast` number, since 6 + 43 + 614 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 24860196 + 39501225 = 4986^2 + 6285^2 .

It is not a de Polignac number, because 64361421 - 2³ = 64361413 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64361491) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22111 + ... + 24851.

It is an arithmetic number, because the mean of its divisors is an integer number (7753005).

Almost surely, 2^64361421 is an apocalyptic number.

It is an amenable number.

64361421 is a deficient number, since it is larger than the sum of its proper divisors (28674639).

64361421 is a wasteful number, since it uses less digits than its factorization.

64361421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5356 (or 5353 counting only the distinct ones).

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

The square root of 64361421 is about 8022.5570113275. The cubic root of 64361421 is about 400.7515474733.

Adding to 64361421 its reverse (12416346), we get a palindrome (76777767).

The spelling of 64361421 in words is "sixty-four million, three hundred sixty-one thousand, four hundred twenty-one".