64211997 has 8 divisors (see below), whose sum is σ = 86191200. Its totient is φ = 42520400.

The previous prime is 64211989. The next prime is 64212007. The reversal of 64211997 is 79911246.

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 64211997 - 2³ = 64211989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64211947) 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, 71379 + ... + 72272.

It is an arithmetic number, because the mean of its divisors is an integer number (10773900).

Almost surely, 2^64211997 is an apocalyptic number.

It is an amenable number.

64211997 is a deficient number, since it is larger than the sum of its proper divisors (21979203).

64211997 is a wasteful number, since it uses less digits than its factorization.

64211997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143803.

The product of its digits is 27216, while the sum is 39.

The square root of 64211997 is about 8013.2388582894. The cubic root of 64211997 is about 400.4411736523.

The spelling of 64211997 in words is "sixty-four million, two hundred eleven thousand, nine hundred ninety-seven".