64689786 has 64 divisors (see below), whose sum is σ = 167443200. Its totient is φ = 18128448.

The previous prime is 64689761. The next prime is 64689787. The reversal of 64689786 is 68798646.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64689787) 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, 18420 + ... + 21648.

It is an arithmetic number, because the mean of its divisors is an integer number (2616300).

Almost surely, 2^64689786 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64689786, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83721600).

64689786 is an abundant number, since it is smaller than the sum of its proper divisors (102753414).

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

64689786 is a wasteful number, since it uses less digits than its factorization.

64689786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3300 (or 3294 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 54.

The square root of 64689786 is about 8042.9960835500. The cubic root of 64689786 is about 401.4319220481.

The spelling of 64689786 in words is "sixty-four million, six hundred eighty-nine thousand, seven hundred eighty-six".