621996440 has 64 divisors (see below), whose sum is σ = 1518320160. Its totient is φ = 227957760.

The previous prime is 621996377. The next prime is 621996451. The reversal of 621996440 is 44699126.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

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, 66875 + ... + 75605.

Almost surely, 2^621996440 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 621996440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (759160080).

621996440 is an abundant number, since it is smaller than the sum of its proper divisors (896323720).

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

621996440 is a wasteful number, since it uses less digits than its factorization.

621996440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8892 (or 8888 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 621996440 is about 24939.8564550801. The cubic root of 621996440 is about 853.6161694005.

The spelling of 621996440 in words is "six hundred twenty-one million, nine hundred ninety-six thousand, four hundred forty".