64145540 has 12 divisors (see below), whose sum is σ = 134705676. Its totient is φ = 25658208.

The previous prime is 64145527. The next prime is 64145561. The reversal of 64145540 is 4554146.

It can be written as a sum of positive squares in 2 ways, for example, as 44943616 + 19201924 = 6704^2 + 4382^2 .

It is a super-2 number, since 2×64145540² = 8229300603783200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1603619 + ... + 1603658.

It is an arithmetic number, because the mean of its divisors is an integer number (11225473).

Almost surely, 2^64145540 is an apocalyptic number.

It is an amenable number.

64145540 is an abundant number, since it is smaller than the sum of its proper divisors (70560136).

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

64145540 is a wasteful number, since it uses less digits than its factorization.

64145540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3207286 (or 3207284 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 64145540 is about 8009.0910845114. The cubic root of 64145540 is about 400.3029787850.

Adding to 64145540 its reverse (4554146), we get a palindrome (68699686).

The spelling of 64145540 in words is "sixty-four million, one hundred forty-five thousand, five hundred forty".