64646245 has 8 divisors (see below), whose sum is σ = 78638616. Its totient is φ = 51008256.

The previous prime is 64646233. The next prime is 64646251. The reversal of 64646245 is 54264646.

It can be written as a sum of positive squares in 4 ways, for example, as 7628644 + 57017601 = 2762^2 + 7551^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 64646245 - 2⁷ = 64646117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88192 + ... + 88921.

It is an arithmetic number, because the mean of its divisors is an integer number (9829827).

Almost surely, 2^64646245 is an apocalyptic number.

It is an amenable number.

64646245 is a deficient number, since it is larger than the sum of its proper divisors (13992371).

64646245 is a wasteful number, since it uses less digits than its factorization.

64646245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177191.

The product of its digits is 138240, while the sum is 37.

The square root of 64646245 is about 8040.2888629700. The cubic root of 64646245 is about 401.3418373976.

The spelling of 64646245 in words is "sixty-four million, six hundred forty-six thousand, two hundred forty-five".