64215400 has 24 divisors (see below), whose sum is σ = 149301270. Its totient is φ = 25686080.

The previous prime is 64215343. The next prime is 64215401. The reversal of 64215400 is 451246.

It can be written as a sum of positive squares in 3 ways, for example, as 56520324 + 7695076 = 7518^2 + 2774^2 .

It is not an unprimeable number, because it can be changed into a prime (64215401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 160339 + ... + 160738.

Almost surely, 2^64215400 is an apocalyptic number.

It is an amenable number.

64215400 is an abundant number, since it is smaller than the sum of its proper divisors (85085870).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64215400 is a wasteful number, since it uses less digits than its factorization.

64215400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321093 (or 321084 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 64215400 is about 8013.4511915903. The cubic root of 64215400 is about 400.4482474978.

Adding to 64215400 its reverse (451246), we get a palindrome (64666646).

The spelling of 64215400 in words is "sixty-four million, two hundred fifteen thousand, four hundred".