64640030 has 64 divisors (see below), whose sum is σ = 144281088. Its totient is φ = 20304000.

The previous prime is 64640021. The next prime is 64640041. The reversal of 64640030 is 3004646.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 64639978 and 64640005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 228269 + ... + 228551.

It is an arithmetic number, because the mean of its divisors is an integer number (2254392).

Almost surely, 2^64640030 is an apocalyptic number.

64640030 is an abundant number, since it is smaller than the sum of its proper divisors (79641058).

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

64640030 is a wasteful number, since it uses less digits than its factorization.

64640030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 64640030 is about 8039.9023625912. The cubic root of 64640030 is about 401.3289755036.

Adding to 64640030 its reverse (3004646), we get a palindrome (67644676).

The spelling of 64640030 in words is "sixty-four million, six hundred forty thousand, thirty".