640600620 has 72 divisors (see below), whose sum is σ = 1971589872. Its totient is φ = 155295360.

The previous prime is 640600619. The next prime is 640600621. The reversal of 640600620 is 26006046.

It is an interprime number because it is at equal distance from previous prime (640600619) and next prime (640600621).

It is not an unprimeable number, because it can be changed into a prime (640600621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36859 + ... + 51378.

Almost surely, 2^640600620 is an apocalyptic number.

640600620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

640600620 is an abundant number, since it is smaller than the sum of its proper divisors (1330989252).

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

640600620 is a wasteful number, since it uses less digits than its factorization.

640600620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88271 (or 88258 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 640600620 is about 25310.0892926121. The cubic root of 640600620 is about 862.0433743425.

Adding to 640600620 its reverse (26006046), we get a palindrome (666606666).

The spelling of 640600620 in words is "six hundred forty million, six hundred thousand, six hundred twenty".