64144890 has 96 divisors (see below), whose sum is σ = 174859776. Its totient is φ = 16295040.

The previous prime is 64144889. The next prime is 64144909. The reversal of 64144890 is 9844146.

It is a happy number.

64144890 is a `hidden beast` number, since 641 + 4 + 4 + 8 + 9 + 0 = 666.

It is a super-2 number, since 2×64144890² = 8229133826224200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 231432 + ... + 231708.

It is an arithmetic number, because the mean of its divisors is an integer number (1821456).

Almost surely, 2^64144890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64144890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87429888).

64144890 is an abundant number, since it is smaller than the sum of its proper divisors (110714886).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64144890 is a wasteful number, since it uses less digits than its factorization.

64144890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404 (or 401 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 64144890 is about 8009.0505055219. The cubic root of 64144890 is about 400.3016266629.

The spelling of 64144890 in words is "sixty-four million, one hundred forty-four thousand, eight hundred ninety".