1640065530 has 32 divisors (see below), whose sum is σ = 3994910784. Its totient is φ = 430822656.

The previous prime is 1640065529. The next prime is 1640065591. The reversal of 1640065530 is 355600461.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 405967 + ... + 409986.

It is an arithmetic number, because the mean of its divisors is an integer number (124840962).

Almost surely, 2^1640065530 is an apocalyptic number.

1640065530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1640065530 is an abundant number, since it is smaller than the sum of its proper divisors (2354845254).

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

1640065530 is a wasteful number, since it uses less digits than its factorization.

1640065530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816030.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 1640065530 is about 40497.7225285571. The cubic root of 1640065530 is about 1179.2894146560.

Adding to 1640065530 its reverse (355600461), we get a palindrome (1995665991).

The spelling of 1640065530 in words is "one billion, six hundred forty million, sixty-five thousand, five hundred thirty".