64421351 has 4 divisors (see below), whose sum is σ = 64438104. Its totient is φ = 64404600.

The previous prime is 64421327. The next prime is 64421359. The reversal of 64421351 is 15312446.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64421351 is a prime.

It is a super-3 number, since 3×64421351³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64421351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64421359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 596 + ... + 11366.

It is an arithmetic number, because the mean of its divisors is an integer number (16109526).

Almost surely, 2^64421351 is an apocalyptic number.

64421351 is a deficient number, since it is larger than the sum of its proper divisors (16753).

64421351 is a wasteful number, since it uses less digits than its factorization.

64421351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16752.

The product of its digits is 2880, while the sum is 26.

The square root of 64421351 is about 8026.2912356829. The cubic root of 64421351 is about 400.8758952024.

Adding to 64421351 its reverse (15312446), we get a palindrome (79733797).

The spelling of 64421351 in words is "sixty-four million, four hundred twenty-one thousand, three hundred fifty-one".