64559421 has 18 divisors (see below), whose sum is σ = 99064602. Its totient is φ = 40506240.

The previous prime is 64559419. The next prime is 64559431. The reversal of 64559421 is 12495546.

64559421 is a `hidden beast` number, since 6 + 45 + 594 + 21 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 13793796 + 50765625 = 3714^2 + 7125^2 .

It is not a de Polignac number, because 64559421 - 2¹ = 64559419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64559431) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9810 + ... + 15011.

It is an arithmetic number, because the mean of its divisors is an integer number (5503589).

Almost surely, 2^64559421 is an apocalyptic number.

It is an amenable number.

64559421 is a deficient number, since it is larger than the sum of its proper divisors (34505181).

64559421 is a wasteful number, since it uses less digits than its factorization.

64559421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24861 (or 24841 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 64559421 is about 8034.8877403483. The cubic root of 64559421 is about 401.1620810663.

It can be divided in two parts, 64559 and 421, that added together give a triangular number (64980 = T₃₆₀).

The spelling of 64559421 in words is "sixty-four million, five hundred fifty-nine thousand, four hundred twenty-one".