621973453920 has 1152 divisors, whose sum is σ = 2651419008000. Its totient is φ = 119181017088.

The previous prime is 621973453877. The next prime is 621973453957. The reversal of 621973453920 is 29354379126.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 366081231 + ... + 366082929.

It is an arithmetic number, because the mean of its divisors is an integer number (2301579000).

Almost surely, 2^621973453920 is an apocalyptic number.

621973453920 is a gapful number since it is divisible by the number (60) 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 621973453920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1325709504000).

621973453920 is an abundant number, since it is smaller than the sum of its proper divisors (2029445554080).

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

621973453920 is a wasteful number, since it uses less digits than its factorization.

621973453920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1800 (or 1775 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 51.

The spelling of 621973453920 in words is "six hundred twenty-one billion, nine hundred seventy-three million, four hundred fifty-three thousand, nine hundred twenty".