64919421 has 16 divisors (see below), whose sum is σ = 109916800. Its totient is φ = 37096704.

The previous prime is 64919417. The next prime is 64919431. The reversal of 64919421 is 12491946.

It is a happy number.

64919421 is a `hidden beast` number, since 649 + 1 + 9 + 4 + 2 + 1 = 666.

It is not a de Polignac number, because 64919421 - 2² = 64919417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64919431) 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 15 ways as a sum of consecutive naturals, for example, 171556 + ... + 171933.

It is an arithmetic number, because the mean of its divisors is an integer number (6869800).

Almost surely, 2^64919421 is an apocalyptic number.

It is an amenable number.

64919421 is a deficient number, since it is larger than the sum of its proper divisors (44997379).

64919421 is a wasteful number, since it uses less digits than its factorization.

64919421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343505 (or 343499 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 64919421 is about 8057.2589011400. The cubic root of 64919421 is about 401.9063604576.

The spelling of 64919421 in words is "sixty-four million, nine hundred nineteen thousand, four hundred twenty-one".