1621466688 has 224 divisors, whose sum is σ = 4767315840. Its totient is φ = 484392960.

The previous prime is 1621466663. The next prime is 1621466699. The reversal of 1621466688 is 8866641261.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a nude number because it is divisible by every one of its digits.

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, 5533870 + ... + 5534162.

It is an arithmetic number, because the mean of its divisors is an integer number (21282660).

Almost surely, 2^1621466688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1621466688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2383657920).

1621466688 is an abundant number, since it is smaller than the sum of its proper divisors (3145849152).

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

1621466688 is a wasteful number, since it uses less digits than its factorization.

1621466688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405 (or 395 counting only the distinct ones).

The product of its digits is 663552, while the sum is 48.

The square root of 1621466688 is about 40267.4395510815. The cubic root of 1621466688 is about 1174.8146230563.

The spelling of 1621466688 in words is "one billion, six hundred twenty-one million, four hundred sixty-six thousand, six hundred eighty-eight".