64645800 has 96 divisors (see below), whose sum is σ = 201936480. Its totient is φ = 17107200.

The previous prime is 64645793. The next prime is 64645837. The reversal of 64645800 is 854646.

It is a happy number.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 97470 + ... + 98130.

It is an arithmetic number, because the mean of its divisors is an integer number (2103505).

Almost surely, 2^64645800 is an apocalyptic number.

64645800 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 64645800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100968240).

64645800 is an abundant number, since it is smaller than the sum of its proper divisors (137290680).

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

64645800 is a wasteful number, since it uses less digits than its factorization.

64645800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843 (or 834 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 64645800 is about 8040.2611897873. The cubic root of 64645800 is about 401.3409165010.

The spelling of 64645800 in words is "sixty-four million, six hundred forty-five thousand, eight hundred".