640602426 has 8 divisors (see below), whose sum is σ = 1281204864. Its totient is φ = 213534140.

The previous prime is 640602421. The next prime is 640602437. The reversal of 640602426 is 624206046.

640602426 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

640602426 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 640602393 and 640602402.

It is not an unprimeable number, because it can be changed into a prime (640602421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53383530 + ... + 53383541.

It is an arithmetic number, because the mean of its divisors is an integer number (160150608).

Almost surely, 2^640602426 is an apocalyptic number.

640602426 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

640602426 is a wasteful number, since it uses less digits than its factorization.

640602426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106767076.

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 640602426 is about 25310.1249700589. The cubic root of 640602426 is about 862.0441844410.

The spelling of 640602426 in words is "six hundred forty million, six hundred two thousand, four hundred twenty-six".