64384690 has 16 divisors (see below), whose sum is σ = 115999128. Its totient is φ = 25730176.

The previous prime is 64384667. The next prime is 64384693. The reversal of 64384690 is 9648346.

It can be written as a sum of positive squares in 4 ways, for example, as 63984001 + 400689 = 7999^2 + 633^2 .

It is a super-2 number, since 2×64384690² = 8290776612792200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64384693) 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, 12084 + ... + 16576.

Almost surely, 2^64384690 is an apocalyptic number.

64384690 is a deficient number, since it is larger than the sum of its proper divisors (51614438).

64384690 is a wasteful number, since it uses less digits than its factorization.

64384690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5933.

The product of its (nonzero) digits is 124416, while the sum is 40.

The square root of 64384690 is about 8024.0071036858. The cubic root of 64384690 is about 400.7998370856.

The spelling of 64384690 in words is "sixty-four million, three hundred eighty-four thousand, six hundred ninety".