1621628712 has 96 divisors (see below), whose sum is σ = 4815720000. Its totient is φ = 488885760.

The previous prime is 1621628707. The next prime is 1621628737. The reversal of 1621628712 is 2178261261.

1621628712 is a `hidden beast` number, since 1 + 6 + 21 + 628 + 7 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 152464 + ... + 162752.

It is an arithmetic number, because the mean of its divisors is an integer number (50163750).

Almost surely, 2^1621628712 is an apocalyptic number.

1621628712 is a gapful number since it is divisible by the number (12) 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 1621628712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2407860000).

1621628712 is an abundant number, since it is smaller than the sum of its proper divisors (3194091288).

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

1621628712 is a wasteful number, since it uses less digits than its factorization.

1621628712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10511 (or 10504 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 1621628712 is about 40269.4513496273. The cubic root of 1621628712 is about 1174.8537526143.

Adding to 1621628712 its reverse (2178261261), we get a palindrome (3799889973).

The spelling of 1621628712 in words is "one billion, six hundred twenty-one million, six hundred twenty-eight thousand, seven hundred twelve".