64416981 has 8 divisors (see below), whose sum is σ = 85939360. Its totient is φ = 42919632.

The previous prime is 64416959. The next prime is 64417007. The reversal of 64416981 is 18961446.

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

It is not a de Polignac number, because 64416981 - 2¹³ = 64408789 is a prime.

It is a super-2 number, since 2×64416981² = 8299094882308722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64416901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 930 + ... + 11388.

It is an arithmetic number, because the mean of its divisors is an integer number (10742420).

Almost surely, 2^64416981 is an apocalyptic number.

It is an amenable number.

64416981 is a deficient number, since it is larger than the sum of its proper divisors (21522379).

64416981 is a wasteful number, since it uses less digits than its factorization.

64416981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12515.

The product of its digits is 41472, while the sum is 39.

The square root of 64416981 is about 8026.0190007251. The cubic root of 64416981 is about 400.8668305716.

The spelling of 64416981 in words is "sixty-four million, four hundred sixteen thousand, nine hundred eighty-one".