64443090 has 32 divisors (see below), whose sum is σ = 163762560. Its totient is φ = 16173824.

The previous prime is 64443061. The next prime is 64443097. The reversal of 64443090 is 9034446.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (64443097) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62670 + ... + 63689.

It is an arithmetic number, because the mean of its divisors is an integer number (5117580).

Almost surely, 2^64443090 is an apocalyptic number.

64443090 is an abundant number, since it is smaller than the sum of its proper divisors (99319470).

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

64443090 is a wasteful number, since it uses less digits than its factorization.

64443090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126386.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 64443090 is about 8027.6453583850. The cubic root of 64443090 is about 400.9209820195.

It can be divided in two parts, 644 and 43090, that added together give a palindrome (43734).

The spelling of 64443090 in words is "sixty-four million, four hundred forty-three thousand, ninety".