621133452 has 72 divisors (see below), whose sum is σ = 1613067456. Its totient is φ = 201416544.

The previous prime is 621133441. The next prime is 621133459. The reversal of 621133452 is 254331126.

621133452 is a `hidden beast` number, since 621 + 1 + 3 + 34 + 5 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (621133459) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 474583 + ... + 475889.

Almost surely, 2^621133452 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 621133452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (806533728).

621133452 is an abundant number, since it is smaller than the sum of its proper divisors (991934004).

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

621133452 is a wasteful number, since it uses less digits than its factorization.

621133452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667 (or 1662 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 621133452 is about 24922.5490670597. The cubic root of 621133452 is about 853.2212038674.

Adding to 621133452 its reverse (254331126), we get a palindrome (875464578).

The spelling of 621133452 in words is "six hundred twenty-one million, one hundred thirty-three thousand, four hundred fifty-two".