660607820 has 24 divisors (see below), whose sum is σ = 1435114800. Its totient is φ = 255131072.

The previous prime is 660607807. The next prime is 660607823. The reversal of 660607820 is 28706066.

It is not an unprimeable number, because it can be changed into a prime (660607823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 568910 + ... + 570069.

It is an arithmetic number, because the mean of its divisors is an integer number (59796450).

Almost surely, 2^660607820 is an apocalyptic number.

It is an amenable number.

660607820 is an abundant number, since it is smaller than the sum of its proper divisors (774506980).

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

660607820 is a wasteful number, since it uses less digits than its factorization.

660607820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139017 (or 1139015 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 660607820 is about 25702.2921156849. The cubic root of 660607820 is about 870.9259617644.

The spelling of 660607820 in words is "six hundred sixty million, six hundred seven thousand, eight hundred twenty".