64421623 has 12 divisors (see below), whose sum is σ = 75071280. Its totient is φ = 55121472.

The previous prime is 64421603. The next prime is 64421633. The reversal of 64421623 is 32612446.

It is not a de Polignac number, because 64421623 - 2⁹ = 64421111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64421591 and 64421600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64421603) 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, 48790 + ... + 50092.

It is an arithmetic number, because the mean of its divisors is an integer number (6255940).

Almost surely, 2^64421623 is an apocalyptic number.

64421623 is a deficient number, since it is larger than the sum of its proper divisors (10649657).

64421623 is a wasteful number, since it uses less digits than its factorization.

64421623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2326 (or 2319 counting only the distinct ones).

The product of its digits is 6912, while the sum is 28.

The square root of 64421623 is about 8026.3081799791. The cubic root of 64421623 is about 400.8764593947.

The spelling of 64421623 in words is "sixty-four million, four hundred twenty-one thousand, six hundred twenty-three".