64871840 has 192 divisors, whose sum is σ = 182891520. Its totient is φ = 21504000.

The previous prime is 64871827. The next prime is 64871861. The reversal of 64871840 is 4817846.

It is a junction number, because it is equal to n+sod(n) for n = 64871794 and 64871803.

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, 1582220 + ... + 1582260.

It is an arithmetic number, because the mean of its divisors is an integer number (952560).

Almost surely, 2^64871840 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 64871840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91445760).

64871840 is an abundant number, since it is smaller than the sum of its proper divisors (118019680).

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

64871840 is a wasteful number, since it uses less digits than its factorization.

64871840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 64871840 is about 8054.3056808145. The cubic root of 64871840 is about 401.8081475239.

The spelling of 64871840 in words is "sixty-four million, eight hundred seventy-one thousand, eight hundred forty".