1621868576 has 48 divisors (see below), whose sum is σ = 3383856000. Its totient is φ = 763054848.

The previous prime is 1621868551. The next prime is 1621868581. The reversal of 1621868576 is 6758681261.

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, 81641 + ... + 99543.

It is an arithmetic number, because the mean of its divisors is an integer number (70497000).

Almost surely, 2^1621868576 is an apocalyptic number.

1621868576 is a gapful number since it is divisible by the number (16) 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 1621868576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1691928000).

1621868576 is an abundant number, since it is smaller than the sum of its proper divisors (1761987424).

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

1621868576 is a wasteful number, since it uses less digits than its factorization.

1621868576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18081 (or 18073 counting only the distinct ones).

The product of its digits is 967680, while the sum is 50.

The square root of 1621868576 is about 40272.4294772491. The cubic root of 1621868576 is about 1174.9116761133.

The spelling of 1621868576 in words is "one billion, six hundred twenty-one million, eight hundred sixty-eight thousand, five hundred seventy-six".