1231764660 has 72 divisors (see below), whose sum is σ = 4270121856. Its totient is φ = 281545920.

The previous prime is 1231764659. The next prime is 1231764689. The reversal of 1231764660 is 664671321.

It is a happy number.

1231764660 is a `hidden beast` number, since 1 + 2 + 3 + 1 + 7 + 646 + 6 + 0 = 666.

1231764660 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 487536 + ... + 490055.

It is an arithmetic number, because the mean of its divisors is an integer number (59307248).

Almost surely, 2^1231764660 is an apocalyptic number.

1231764660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231764660 is an abundant number, since it is smaller than the sum of its proper divisors (3038357196).

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

1231764660 is a wasteful number, since it uses less digits than its factorization.

1231764660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 977613 (or 977608 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 1231764660 is about 35096.5049541974. The cubic root of 1231764660 is about 1071.9534176777.

The spelling of 1231764660 in words is "one billion, two hundred thirty-one million, seven hundred sixty-four thousand, six hundred sixty".