640623060 has 576 divisors, whose sum is σ = 2647572480. Its totient is φ = 127008000.

The previous prime is 640623043. The next prime is 640623077. The reversal of 640623060 is 60326046.

It is an interprime number because it is at equal distance from previous prime (640623043) and next prime (640623077).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 9022825 + ... + 9022895.

It is an arithmetic number, because the mean of its divisors is an integer number (4596480).

Almost surely, 2^640623060 is an apocalyptic number.

640623060 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 640623060, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1323786240).

640623060 is an abundant number, since it is smaller than the sum of its proper divisors (2006949420).

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

640623060 is a wasteful number, since it uses less digits than its factorization.

640623060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 640623060 is about 25310.5325902084. The cubic root of 640623060 is about 862.0534399106.

The spelling of 640623060 in words is "six hundred forty million, six hundred twenty-three thousand, sixty".