621648126 has 48 divisors (see below), whose sum is σ = 1475929728. Its totient is φ = 187534800.

The previous prime is 621648113. The next prime is 621648149. The reversal of 621648126 is 621846126.

621648126 is a `hidden beast` number, since 6 + 2 + 1 + 648 + 1 + 2 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38031 + ... + 51861.

It is an arithmetic number, because the mean of its divisors is an integer number (30748536).

Almost surely, 2^621648126 is an apocalyptic number.

621648126 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 621648126, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (737964864).

621648126 is an abundant number, since it is smaller than the sum of its proper divisors (854281602).

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

621648126 is a wasteful number, since it uses less digits than its factorization.

621648126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14077 (or 14074 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 621648126 is about 24932.8723977002. The cubic root of 621648126 is about 853.4567997960.

The spelling of 621648126 in words is "six hundred twenty-one million, six hundred forty-eight thousand, one hundred twenty-six".