64212005 has 32 divisors (see below), whose sum is σ = 93477888. Its totient is φ = 41702400.

The previous prime is 64211989. The next prime is 64212007. The reversal of 64212005 is 50021246.

It is a happy number.

It is not a de Polignac number, because 64212005 - 2⁴ = 64211989 is a prime.

It is a super-2 number, since 2×64212005² = 8246363172240050, 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 (64212007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20717 + ... + 23613.

It is an arithmetic number, because the mean of its divisors is an integer number (2921184).

Almost surely, 2^64212005 is an apocalyptic number.

64212005 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

64212005 is a deficient number, since it is larger than the sum of its proper divisors (29265883).

64212005 is a wasteful number, since it uses less digits than its factorization.

64212005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2957.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 64212005 is about 8013.2393574634. The cubic root of 64212005 is about 400.4411902823.

The spelling of 64212005 in words is "sixty-four million, two hundred twelve thousand, five".