64349890869 has 8 divisors (see below), whose sum is σ = 93599841312. Its totient is φ = 38999933840.

The previous prime is 64349890841. The next prime is 64349890901. The reversal of 64349890869 is 96809894346.

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 64349890869 - 2⁹ = 64349890357 is a prime.

It is a super-2 number, since 2×64349890869² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64349890819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 974998314 + ... + 974998379.

It is an arithmetic number, because the mean of its divisors is an integer number (11699980164).

Almost surely, 2^64349890869 is an apocalyptic number.

It is an amenable number.

64349890869 is a deficient number, since it is larger than the sum of its proper divisors (29249950443).

64349890869 is a wasteful number, since it uses less digits than its factorization.

64349890869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1949996707.

The product of its (nonzero) digits is 80621568, while the sum is 66.

The spelling of 64349890869 in words is "sixty-four billion, three hundred forty-nine million, eight hundred ninety thousand, eight hundred sixty-nine".