640656060 has 192 divisors, whose sum is σ = 2105671680. Its totient is φ = 143873280.

The previous prime is 640656019. The next prime is 640656061. The reversal of 640656060 is 60656046.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640656061) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 588837 + ... + 589923.

It is an arithmetic number, because the mean of its divisors is an integer number (10967040).

Almost surely, 2^640656060 is an apocalyptic number.

640656060 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 640656060, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1052835840).

640656060 is an abundant number, since it is smaller than the sum of its proper divisors (1465015620).

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

640656060 is a wasteful number, since it uses less digits than its factorization.

640656060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176 (or 1174 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 640656060 is about 25311.1844843342. The cubic root of 640656060 is about 862.0682417896.

It can be divided in two parts, 64065 and 6060, that added together give a triangular number (70125 = T₃₇₄).

The spelling of 640656060 in words is "six hundred forty million, six hundred fifty-six thousand, sixty".