621522072 has 224 divisors, whose sum is σ = 1888704000. Its totient is φ = 191056320.

The previous prime is 621522071. The next prime is 621522089. The reversal of 621522072 is 270225126.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621522071) by changing a digit.

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 55 ways as a sum of consecutive naturals, for example, 7867329 + ... + 7867407.

Almost surely, 2^621522072 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 621522072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (944352000).

621522072 is an abundant number, since it is smaller than the sum of its proper divisors (1267181928).

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

621522072 is a wasteful number, since it uses less digits than its factorization.

621522072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193 (or 174 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 621522072 is about 24930.3444019532. The cubic root of 621522072 is about 853.3991096487.

Adding to 621522072 its reverse (270225126), we get a palindrome (891747198).

The spelling of 621522072 in words is "six hundred twenty-one million, five hundred twenty-two thousand, seventy-two".