621542972090040 has 1024 divisors, whose sum is σ = 2511345156526080. Its totient is φ = 118846586880000.

The previous prime is 621542972089973. The next prime is 621542972090081. The reversal of 621542972090040 is 40090279245126.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 109871478892 + ... + 109871484548.

It is an arithmetic number, because the mean of its divisors is an integer number (2452485504420).

Almost surely, 2^{621542972090040} is an apocalyptic number.

621542972090040 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 621542972090040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1255672578263040).

621542972090040 is an abundant number, since it is smaller than the sum of its proper divisors (1889802184436040).

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

621542972090040 is a wasteful number, since it uses less digits than its factorization.

621542972090040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8384 (or 8380 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 51.

The spelling of 621542972090040 in words is "six hundred twenty-one trillion, five hundred forty-two billion, nine hundred seventy-two million, ninety thousand, forty".