1640470140 has 144 divisors (see below), whose sum is σ = 5111608320. Its totient is φ = 425658240.

The previous prime is 1640470087. The next prime is 1640470141. The reversal of 1640470140 is 410740461.

1640470140 is a `hidden beast` number, since 1 + 640 + 4 + 7 + 0 + 14 + 0 = 666.

It is a super-2 number, since 2×1640470140² = 5382284560463239200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640470141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1784601 + ... + 1785519.

It is an arithmetic number, because the mean of its divisors is an integer number (35497280).

Almost surely, 2^1640470140 is an apocalyptic number.

1640470140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1640470140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2555804160).

1640470140 is an abundant number, since it is smaller than the sum of its proper divisors (3471138180).

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

1640470140 is a wasteful number, since it uses less digits than its factorization.

1640470140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1192 (or 1187 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 1640470140 is about 40502.7176865948. The cubic root of 1640470140 is about 1179.3863849799.

The spelling of 1640470140 in words is "one billion, six hundred forty million, four hundred seventy thousand, one hundred forty".