660266040 has 64 divisors (see below), whose sum is σ = 2263772160. Its totient is φ = 150917760.

The previous prime is 660266021. The next prime is 660266041. The reversal of 660266040 is 40662066.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 660265989 and 660266007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660266041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 392176 + ... + 393855.

It is an arithmetic number, because the mean of its divisors is an integer number (35371440).

Almost surely, 2^660266040 is an apocalyptic number.

660266040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

660266040 is an abundant number, since it is smaller than the sum of its proper divisors (1603506120).

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

660266040 is a wasteful number, since it uses less digits than its factorization.

660266040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786052 (or 786048 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 660266040 is about 25695.6424321323. The cubic root of 660266040 is about 870.7757382806.

The spelling of 660266040 in words is "six hundred sixty million, two hundred sixty-six thousand, forty".