64809390 has 32 divisors (see below), whose sum is σ = 155842560. Its totient is φ = 17249184.

The previous prime is 64809373. The next prime is 64809401. The reversal of 64809390 is 9390846.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 16431 + ... + 19989.

It is an arithmetic number, because the mean of its divisors is an integer number (4870080).

Almost surely, 2^64809390 is an apocalyptic number.

64809390 is an abundant number, since it is smaller than the sum of its proper divisors (91033170).

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

64809390 is a wasteful number, since it uses less digits than its factorization.

64809390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4176.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 64809390 is about 8050.4279389359. The cubic root of 64809390 is about 401.6791702709.

The spelling of 64809390 in words is "sixty-four million, eight hundred nine thousand, three hundred ninety".