64404473 has 6 divisors (see below), whose sum is σ = 74919546. Its totient is φ = 55203792.

The previous prime is 64404421. The next prime is 64404479. The reversal of 64404473 is 37440446.

It can be written as a sum of positive squares in only one way, i.e., 52591504 + 11812969 = 7252^2 + 3437^2 .

It is not a de Polignac number, because 64404473 - 2¹⁸ = 64142329 is a prime.

It is a super-2 number, since 2×64404473² = 8295872284815458, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64404479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 657140 + ... + 657237.

It is an arithmetic number, because the mean of its divisors is an integer number (12486591).

Almost surely, 2^64404473 is an apocalyptic number.

It is an amenable number.

64404473 is a deficient number, since it is larger than the sum of its proper divisors (10515073).

64404473 is a wasteful number, since it uses less digits than its factorization.

64404473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1314391 (or 1314384 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 32.

The square root of 64404473 is about 8025.2397471976. The cubic root of 64404473 is about 400.8408831335.

The spelling of 64404473 in words is "sixty-four million, four hundred four thousand, four hundred seventy-three".