64332690 has 64 divisors (see below), whose sum is σ = 159570432. Its totient is φ = 16588800.

The previous prime is 64332673. The next prime is 64332691. The reversal of 64332690 is 9623346.

It is a super-2 number, since 2×64332690² = 8277390005272200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64332691) 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, 237255 + ... + 237525.

It is an arithmetic number, because the mean of its divisors is an integer number (2493288).

Almost surely, 2^64332690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64332690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79785216).

64332690 is an abundant number, since it is smaller than the sum of its proper divisors (95237742).

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

64332690 is a wasteful number, since it uses less digits than its factorization.

64332690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515.

The product of its (nonzero) digits is 23328, while the sum is 33.

The square root of 64332690 is about 8020.7661728790. The cubic root of 64332690 is about 400.6919066396.

It can be divided in two parts, 643 and 32690, that added together give a palindrome (33333).

The spelling of 64332690 in words is "sixty-four million, three hundred thirty-two thousand, six hundred ninety".