64851864 has 128 divisors (see below), whose sum is σ = 212889600. Its totient is φ = 15949440.

The previous prime is 64851863. The next prime is 64851887. The reversal of 64851864 is 46815846.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64851863) 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, 34189 + ... + 36035.

It is an arithmetic number, because the mean of its divisors is an integer number (1663200).

Almost surely, 2^64851864 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 64851864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106444800).

64851864 is an abundant number, since it is smaller than the sum of its proper divisors (148037736).

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

64851864 is a wasteful number, since it uses less digits than its factorization.

64851864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1893 (or 1889 counting only the distinct ones).

The product of its digits is 184320, while the sum is 42.

The square root of 64851864 is about 8053.0655032727. The cubic root of 64851864 is about 401.7669003327.

The spelling of 64851864 in words is "sixty-four million, eight hundred fifty-one thousand, eight hundred sixty-four".