660409240 has 32 divisors (see below), whose sum is σ = 1493717760. Its totient is φ = 262777600.

The previous prime is 660409231. The next prime is 660409247. The reversal of 660409240 is 42904066.

660409240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×660409240² = 872280728554755200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660409247) 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, 35581 + ... + 50860.

It is an arithmetic number, because the mean of its divisors is an integer number (46678680).

Almost surely, 2^660409240 is an apocalyptic number.

It is an amenable number.

660409240 is an abundant number, since it is smaller than the sum of its proper divisors (833308520).

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

660409240 is a wasteful number, since it uses less digits than its factorization.

660409240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86643 (or 86639 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 660409240 is about 25698.4287457424. The cubic root of 660409240 is about 870.8386856708.

The spelling of 660409240 in words is "six hundred sixty million, four hundred nine thousand, two hundred forty".