64121947 has 8 divisors (see below), whose sum is σ = 65140992. Its totient is φ = 63110400.

The previous prime is 64121879. The next prime is 64121957. The reversal of 64121947 is 74912146.

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 64121947 - 2⁷ = 64121819 is a prime.

It is a super-3 number, since 3×64121947³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64121957) 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, 16797 + ... + 20257.

It is an arithmetic number, because the mean of its divisors is an integer number (8142624).

Almost surely, 2^64121947 is an apocalyptic number.

64121947 is a deficient number, since it is larger than the sum of its proper divisors (1019045).

64121947 is a wasteful number, since it uses less digits than its factorization.

64121947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3749.

The product of its digits is 12096, while the sum is 34.

The square root of 64121947 is about 8007.6180603223. The cubic root of 64121947 is about 400.2538950591.

The spelling of 64121947 in words is "sixty-four million, one hundred twenty-one thousand, nine hundred forty-seven".