64921351 has 8 divisors (see below), whose sum is σ = 74989584. Its totient is φ = 55547520.

The previous prime is 64921349. The next prime is 64921369. The reversal of 64921351 is 15312946.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64921351 - 2¹ = 64921349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64921301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173400 + ... + 173773.

It is an arithmetic number, because the mean of its divisors is an integer number (9373698).

Almost surely, 2^64921351 is an apocalyptic number.

64921351 is a deficient number, since it is larger than the sum of its proper divisors (10068233).

64921351 is a wasteful number, since it uses less digits than its factorization.

64921351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347201.

The product of its digits is 6480, while the sum is 31.

The square root of 64921351 is about 8057.3786680285. The cubic root of 64921351 is about 401.9103431979.

The spelling of 64921351 in words is "sixty-four million, nine hundred twenty-one thousand, three hundred fifty-one".