123651660 has 96 divisors (see below), whose sum is σ = 386572032. Its totient is φ = 29272320.

The previous prime is 123651629. The next prime is 123651721. The reversal of 123651660 is 66156321.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26202 + ... + 30558.

It is an arithmetic number, because the mean of its divisors is an integer number (4026792).

Almost surely, 2^123651660 is an apocalyptic number.

123651660 is a gapful number since it is divisible by the number (10) 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 123651660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (193286016).

123651660 is an abundant number, since it is smaller than the sum of its proper divisors (262920372).

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

123651660 is a wasteful number, since it uses less digits than its factorization.

123651660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4423 (or 4421 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 123651660 is about 11119.8767978787. The cubic root of 123651660 is about 498.1957102420.

The spelling of 123651660 in words is "one hundred twenty-three million, six hundred fifty-one thousand, six hundred sixty".