64281840 has 160 divisors (see below), whose sum is σ = 230985216. Its totient is φ = 14484480.

The previous prime is 64281823. The next prime is 64281851. The reversal of 64281840 is 4818246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 139210 + ... + 139670.

Almost surely, 2^64281840 is an apocalyptic number.

64281840 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 64281840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115492608).

64281840 is an abundant number, since it is smaller than the sum of its proper divisors (166703376).

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

64281840 is a wasteful number, since it uses less digits than its factorization.

64281840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567 (or 561 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 64281840 is about 8017.5956495698. The cubic root of 64281840 is about 400.5863068575.

The spelling of 64281840 in words is "sixty-four million, two hundred eighty-one thousand, eight hundred forty".