1640011220 has 24 divisors (see below), whose sum is σ = 3625288800. Its totient is φ = 621477792.

The previous prime is 1640011189. The next prime is 1640011223. The reversal of 1640011220 is 221100461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640011223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2157530 + ... + 2158289.

It is an arithmetic number, because the mean of its divisors is an integer number (151053700).

Almost surely, 2^1640011220 is an apocalyptic number.

1640011220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1640011220 is an abundant number, since it is smaller than the sum of its proper divisors (1985277580).

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

1640011220 is a wasteful number, since it uses less digits than its factorization.

1640011220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4315847 (or 4315845 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1640011220 is about 40497.0519914722. The cubic root of 1640011220 is about 1179.2763973073.

Adding to 1640011220 its reverse (221100461), we get a palindrome (1861111681).

The spelling of 1640011220 in words is "one billion, six hundred forty million, eleven thousand, two hundred twenty".