660460642 has 16 divisors (see below), whose sum is σ = 1082806272. Its totient is φ = 300778560.

The previous prime is 660460639. The next prime is 660460649. The reversal of 660460642 is 246064066.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 660460598 and 660460607.

It is not an unprimeable number, because it can be changed into a prime (660460649) 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, 312258 + ... + 314365.

It is an arithmetic number, because the mean of its divisors is an integer number (67675392).

Almost surely, 2^660460642 is an apocalyptic number.

660460642 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

660460642 is a deficient number, since it is larger than the sum of its proper divisors (422345630).

660460642 is a wasteful number, since it uses less digits than its factorization.

660460642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626673.

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 660460642 is about 25699.4288263378. The cubic root of 660460642 is about 870.8612785754.

The spelling of 660460642 in words is "six hundred sixty million, four hundred sixty thousand, six hundred forty-two".