621143652 has 24 divisors (see below), whose sum is σ = 1496088832. Its totient is φ = 200368800.

The previous prime is 621143639. The next prime is 621143657. The reversal of 621143652 is 256341126.

It is not an unprimeable number, because it can be changed into a prime (621143657) 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 7 ways as a sum of consecutive naturals, for example, 834499 + ... + 835242.

Almost surely, 2^621143652 is an apocalyptic number.

621143652 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

621143652 is an abundant number, since it is smaller than the sum of its proper divisors (874945180).

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

621143652 is a wasteful number, since it uses less digits than its factorization.

621143652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1669779 (or 1669777 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 621143652 is about 24922.7537001833. The cubic root of 621143652 is about 853.2258742587.

Adding to 621143652 its reverse (256341126), we get a palindrome (877484778).

The spelling of 621143652 in words is "six hundred twenty-one million, one hundred forty-three thousand, six hundred fifty-two".