64690390 has 8 divisors (see below), whose sum is σ = 116442720. Its totient is φ = 25876152.

The previous prime is 64690357. The next prime is 64690391. The reversal of 64690390 is 9309646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64690391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3234510 + ... + 3234529.

It is an arithmetic number, because the mean of its divisors is an integer number (14555340).

Almost surely, 2^64690390 is an apocalyptic number.

64690390 is a deficient number, since it is larger than the sum of its proper divisors (51752330).

64690390 is a wasteful number, since it uses less digits than its factorization.

64690390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6469046.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 64690390 is about 8043.0336316591. The cubic root of 64690390 is about 401.4331714165.

The spelling of 64690390 in words is "sixty-four million, six hundred ninety thousand, three hundred ninety".