621575240 has 128 divisors (see below), whose sum is σ = 1655337600. Its totient is φ = 208316160.

The previous prime is 621575197. The next prime is 621575243. The reversal of 621575240 is 42575126.

It is a junction number, because it is equal to n+sod(n) for n = 621575197 and 621575206.

It is not an unprimeable number, because it can be changed into a prime (621575243) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 966359 + ... + 967001.

It is an arithmetic number, because the mean of its divisors is an integer number (12932325).

Almost surely, 2^621575240 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 621575240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (827668800).

621575240 is an abundant number, since it is smaller than the sum of its proper divisors (1033762360).

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

621575240 is a wasteful number, since it uses less digits than its factorization.

621575240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704 (or 674 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 621575240 is about 24931.4107101865. The cubic root of 621575240 is about 853.4234435821.

The spelling of 621575240 in words is "six hundred twenty-one million, five hundred seventy-five thousand, two hundred forty".