64401885 has 20 divisors (see below), whose sum is σ = 115447068. Its totient is φ = 34347456.

The previous prime is 64401881. The next prime is 64401893. The reversal of 64401885 is 58810446.

64401885 is a `hidden beast` number, since 644 + 0 + 1 + 8 + 8 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 32558436 + 31843449 = 5706^2 + 5643^2 .

It is not a de Polignac number, because 64401885 - 2² = 64401881 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64401881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 79104 + ... + 79913.

Almost surely, 2^64401885 is an apocalyptic number.

It is an amenable number.

64401885 is a deficient number, since it is larger than the sum of its proper divisors (51045183).

64401885 is a wasteful number, since it uses less digits than its factorization.

64401885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159034 (or 159025 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 64401885 is about 8025.0785042889. The cubic root of 64401885 is about 400.8355139925.

The spelling of 64401885 in words is "sixty-four million, four hundred one thousand, eight hundred eighty-five".