640103420 has 48 divisors (see below), whose sum is σ = 1486543968. Its totient is φ = 229570560.

The previous prime is 640103393. The next prime is 640103473. The reversal of 640103420 is 24301046.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 640103392 and 640103401.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3869 + ... + 35988.

It is an arithmetic number, because the mean of its divisors is an integer number (30969666).

Almost surely, 2^640103420 is an apocalyptic number.

It is an amenable number.

640103420 is an abundant number, since it is smaller than the sum of its proper divisors (846440548).

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

640103420 is a wasteful number, since it uses less digits than its factorization.

640103420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39950 (or 39948 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 640103420 is about 25300.2652160012. The cubic root of 640103420 is about 861.8202926034.

Adding to 640103420 its reverse (24301046), we get a palindrome (664404466).

The spelling of 640103420 in words is "six hundred forty million, one hundred three thousand, four hundred twenty".