64215145 has 12 divisors (see below), whose sum is σ = 78252804. Its totient is φ = 50587680.

The previous prime is 64215139. The next prime is 64215157. The reversal of 64215145 is 54151246.

It can be written as a sum of positive squares in 2 ways, for example, as 29452329 + 34762816 = 5427^2 + 5896^2 .

It is not a de Polignac number, because 64215145 - 2²⁵ = 30660713 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21015 + ... + 23875.

It is an arithmetic number, because the mean of its divisors is an integer number (6521067).

Almost surely, 2^64215145 is an apocalyptic number.

It is an amenable number.

64215145 is a deficient number, since it is larger than the sum of its proper divisors (14037659).

64215145 is an equidigital number, since it uses as much as digits as its factorization.

64215145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3000 (or 2933 counting only the distinct ones).

The product of its digits is 4800, while the sum is 28.

The square root of 64215145 is about 8013.4352808268. The cubic root of 64215145 is about 400.4477174358.

The spelling of 64215145 in words is "sixty-four million, two hundred fifteen thousand, one hundred forty-five".