1621004160 has 128 divisors (see below), whose sum is σ = 5232844800. Its totient is φ = 426756096.

The previous prime is 1621004159. The next prime is 1621004183. The reversal of 1621004160 is 614001261.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146337 + ... + 157023.

It is an arithmetic number, because the mean of its divisors is an integer number (40881600).

Almost surely, 2^1621004160 is an apocalyptic number.

1621004160 is a gapful number since it is divisible by the number (10) 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 1621004160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2616422400).

1621004160 is an abundant number, since it is smaller than the sum of its proper divisors (3611840640).

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

1621004160 is a wasteful number, since it uses less digits than its factorization.

1621004160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10788 (or 10776 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1621004160 is about 40261.6959404345. The cubic root of 1621004160 is about 1174.7029060251.

The spelling of 1621004160 in words is "one billion, six hundred twenty-one million, four thousand, one hundred sixty".