64840963 has 8 divisors (see below), whose sum is σ = 71732736. Its totient is φ = 58115400.

The previous prime is 64840957. The next prime is 64840973. The reversal of 64840963 is 36904846.

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 64840963 - 2⁵ = 64840931 is a prime.

It is a super-3 number, since 3×64840963³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64840903) 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, 40731 + ... + 42292.

It is an arithmetic number, because the mean of its divisors is an integer number (8966592).

Almost surely, 2^64840963 is an apocalyptic number.

64840963 is a deficient number, since it is larger than the sum of its proper divisors (6891773).

64840963 is a wasteful number, since it uses less digits than its factorization.

64840963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83105.

The product of its (nonzero) digits is 124416, while the sum is 40.

The square root of 64840963 is about 8052.3886518225. The cubic root of 64840963 is about 401.7443879682.

The spelling of 64840963 in words is "sixty-four million, eight hundred forty thousand, nine hundred sixty-three".