64461609 has 8 divisors (see below), whose sum is σ = 95498720. Its totient is φ = 42974388.

The previous prime is 64461589. The next prime is 64461611. The reversal of 64461609 is 90616446.

64461609 is a `hidden beast` number, since 6 + 4 + 46 + 1 + 609 = 666.

It is not a de Polignac number, because 64461609 - 2¹² = 64457513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64461629) 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, 1193707 + ... + 1193760.

It is an arithmetic number, because the mean of its divisors is an integer number (11937340).

Almost surely, 2^64461609 is an apocalyptic number.

It is an amenable number.

64461609 is a deficient number, since it is larger than the sum of its proper divisors (31037111).

64461609 is a wasteful number, since it uses less digits than its factorization.

64461609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2387476 (or 2387470 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 64461609 is about 8028.7987270824. The cubic root of 64461609 is about 400.9593825399.

The spelling of 64461609 in words is "sixty-four million, four hundred sixty-one thousand, six hundred nine".