64671421 has 8 divisors (see below), whose sum is σ = 70423200. Its totient is φ = 59154480.

The previous prime is 64671419. The next prime is 64671433. The reversal of 64671421 is 12417646.

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 64671421 - 2¹ = 64671419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64671401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58135 + ... + 59236.

It is an arithmetic number, because the mean of its divisors is an integer number (8802900).

Almost surely, 2^64671421 is an apocalyptic number.

It is an amenable number.

64671421 is a deficient number, since it is larger than the sum of its proper divisors (5751779).

64671421 is a wasteful number, since it uses less digits than its factorization.

64671421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117419.

The product of its digits is 8064, while the sum is 31.

The square root of 64671421 is about 8041.8543259624. The cubic root of 64671421 is about 401.3939305018.

The spelling of 64671421 in words is "sixty-four million, six hundred seventy-one thousand, four hundred twenty-one".