64540330 has 16 divisors (see below), whose sum is σ = 123006600. Its totient is φ = 24297472.

The previous prime is 64540327. The next prime is 64540331. The reversal of 64540330 is 3304546.

It can be written as a sum of positive squares in 4 ways, for example, as 56806369 + 7733961 = 7537^2 + 2781^2 .

It is a junction number, because it is equal to n+sod(n) for n = 64540295 and 64540304.

It is not an unprimeable number, because it can be changed into a prime (64540331) 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, 189655 + ... + 189994.

Almost surely, 2^64540330 is an apocalyptic number.

64540330 is a deficient number, since it is larger than the sum of its proper divisors (58466270).

64540330 is a wasteful number, since it uses less digits than its factorization.

64540330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379673.

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 64540330 is about 8033.6996458668. The cubic root of 64540330 is about 401.1225343448.

Adding to 64540330 its reverse (3304546), we get a palindrome (67844876).

The spelling of 64540330 in words is "sixty-four million, five hundred forty thousand, three hundred thirty".