64770240 has 224 divisors, whose sum is σ = 223845120. Its totient is φ = 15814656.

The previous prime is 64770229. The next prime is 64770263. The reversal of 64770240 is 4207746.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 64770198 and 64770207.

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 31 ways as a sum of consecutive naturals, for example, 966687 + ... + 966753.

Almost surely, 2^64770240 is an apocalyptic number.

64770240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64770240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111922560).

64770240 is an abundant number, since it is smaller than the sum of its proper divisors (159074880).

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

64770240 is a wasteful number, since it uses less digits than its factorization.

64770240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 30.

The square root of 64770240 is about 8047.9960238559. The cubic root of 64770240 is about 401.5982719777.

Adding to 64770240 its reverse (4207746), we get a palindrome (68977986).

The spelling of 64770240 in words is "sixty-four million, seven hundred seventy thousand, two hundred forty".