640140600 has 192 divisors, whose sum is σ = 2259498240. Its totient is φ = 148403200.

The previous prime is 640140547. The next prime is 640140617. The reversal of 640140600 is 6041046.

It is a Cunningham number, because it is equal to 25301²-1.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 149692 + ... + 153908.

It is an arithmetic number, because the mean of its divisors is an integer number (11768220).

Almost surely, 2^640140600 is an apocalyptic number.

640140600 is a gapful number since it is divisible by the number (60) 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 640140600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1129749120).

640140600 is an abundant number, since it is smaller than the sum of its proper divisors (1619357640).

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

640140600 is a wasteful number, since it uses less digits than its factorization.

640140600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4270 (or 4261 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 640140600 is about 25300.9999802379. Note that the first 4 decimals coincide. The cubic root of 640140600 is about 861.8369783748.

Adding to 640140600 its reverse (6041046), we get a palindrome (646181646).

The spelling of 640140600 in words is "six hundred forty million, one hundred forty thousand, six hundred".