640062020040 has 64 divisors (see below), whose sum is σ = 2003672419200. Its totient is φ = 163262195712.

The previous prime is 640062020027. The next prime is 640062020077. The reversal of 640062020040 is 40020260046.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115950505 + ... + 115956024.

It is an arithmetic number, because the mean of its divisors is an integer number (31307381550).

Almost surely, 2^640062020040 is an apocalyptic number.

640062020040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

640062020040 is an abundant number, since it is smaller than the sum of its proper divisors (1363610399160).

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

640062020040 is a wasteful number, since it uses less digits than its factorization.

640062020040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231906566 (or 231906562 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 640062020040 its reverse (40020260046), we get a palindrome (680082280086).

The spelling of 640062020040 in words is "six hundred forty billion, sixty-two million, twenty thousand, forty".