387487221660 has 1344 divisors, whose sum is σ = 1637279723520. Its totient is φ = 74530160640.

The previous prime is 387487221631. The next prime is 387487221689. The reversal of 387487221660 is 66122784783.

387487221660 is a `hidden beast` number, since 3 + 87 + 487 + 2 + 21 + 6 + 60 = 666.

It is an interprime number because it is at equal distance from previous prime (387487221631) and next prime (387487221689).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 387487221597 and 387487221606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 447 ways as a sum of consecutive naturals, for example, 1507732252 + ... + 1507732508.

It is an arithmetic number, because the mean of its divisors is an integer number (1218214080).

Almost surely, 2^387487221660 is an apocalyptic number.

387487221660 is a gapful number since it is divisible by the number (30) 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 387487221660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (818639861760).

387487221660 is an abundant number, since it is smaller than the sum of its proper divisors (1249792501860).

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

387487221660 is a wasteful number, since it uses less digits than its factorization.

387487221660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398 (or 381 counting only the distinct ones).

The product of its (nonzero) digits is 5419008, while the sum is 54.

The spelling of 387487221660 in words is "three hundred eighty-seven billion, four hundred eighty-seven million, two hundred twenty-one thousand, six hundred sixty".