64785840 has 160 divisors (see below), whose sum is σ = 234508800. Its totient is φ = 14789376.

The previous prime is 64785823. The next prime is 64785841. The reversal of 64785840 is 4858746.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nialpdrome in base 14.

It is a zygodrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 64785792 and 64785801.

It is not an unprimeable number, because it can be changed into a prime (64785841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81927 + ... + 82713.

It is an arithmetic number, because the mean of its divisors is an integer number (1465680).

Almost surely, 2^64785840 is an apocalyptic number.

64785840 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 64785840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117254400).

64785840 is an abundant number, since it is smaller than the sum of its proper divisors (169722960).

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

64785840 is a wasteful number, since it uses less digits than its factorization.

64785840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824 (or 804 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 42.

The square root of 64785840 is about 8048.9651508750. The cubic root of 64785840 is about 401.6305112187.

The spelling of 64785840 in words is "sixty-four million, seven hundred eighty-five thousand, eight hundred forty".