64055840 has 72 divisors (see below), whose sum is σ = 159859980. Its totient is φ = 24251904.

The previous prime is 64055839. The next prime is 64055891. The reversal of 64055840 is 4855046.

It can be written as a sum of positive squares in 2 ways, for example, as 54346384 + 9709456 = 7372^2 + 3116^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 64055797 and 64055806.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57206 + ... + 58314.

Almost surely, 2^64055840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64055840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79929990).

64055840 is an abundant number, since it is smaller than the sum of its proper divisors (95804140).

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

64055840 is a wasteful number, since it uses less digits than its factorization.

64055840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1162 (or 1135 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 64055840 is about 8003.4892390757. The cubic root of 64055840 is about 400.1162995161.

The spelling of 64055840 in words is "sixty-four million, fifty-five thousand, eight hundred forty".