1621147660 has 24 divisors (see below), whose sum is σ = 3713902416. Its totient is φ = 589508160.

The previous prime is 1621147613. The next prime is 1621147699. The reversal of 1621147660 is 667411261.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3684207 + ... + 3684646.

It is an arithmetic number, because the mean of its divisors is an integer number (154745934).

Almost surely, 2^1621147660 is an apocalyptic number.

1621147660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1621147660 is an abundant number, since it is smaller than the sum of its proper divisors (2092754756).

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

1621147660 is a wasteful number, since it uses less digits than its factorization.

1621147660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7368873 (or 7368871 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 1621147660 is about 40263.4779918476. The cubic root of 1621147660 is about 1174.7375686738.

The spelling of 1621147660 in words is "one billion, six hundred twenty-one million, one hundred forty-seven thousand, six hundred sixty".