64394990 has 48 divisors (see below), whose sum is σ = 134159760. Its totient is φ = 22176000.

The previous prime is 64394989. The next prime is 64394999. The reversal of 64394990 is 9949346.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64394999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21590 + ... + 24390.

It is an arithmetic number, because the mean of its divisors is an integer number (2794995).

Almost surely, 2^64394990 is an apocalyptic number.

64394990 is an abundant number, since it is smaller than the sum of its proper divisors (69764770).

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

64394990 is a wasteful number, since it uses less digits than its factorization.

64394990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2849 (or 2838 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 64394990 is about 8024.6489019770. The cubic root of 64394990 is about 400.8212087202.

The spelling of 64394990 in words is "sixty-four million, three hundred ninety-four thousand, nine hundred ninety".