621621010 has 8 divisors (see below), whose sum is σ = 1118917836. Its totient is φ = 248648400.

The previous prime is 621620999. The next prime is 621621037. The reversal of 621621010 is 10126126.

It can be written as a sum of positive squares in 2 ways, for example, as 610040601 + 11580409 = 24699^2 + 3403^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 31081041 + ... + 31081060.

Almost surely, 2^621621010 is an apocalyptic number.

621621010 is a deficient number, since it is larger than the sum of its proper divisors (497296826).

621621010 is a wasteful number, since it uses less digits than its factorization.

621621010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62162108.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 621621010 is about 24932.3286116640. The cubic root of 621621010 is about 853.4443904870. Note that the first 3 decimals are identical.

Adding to 621621010 its reverse (10126126), we get a palindrome (631747136).

The spelling of 621621010 in words is "six hundred twenty-one million, six hundred twenty-one thousand, ten".