621750406 has 8 divisors (see below), whose sum is σ = 942240600. Its totient is φ = 307670208.

The previous prime is 621750403. The next prime is 621750443. The reversal of 621750406 is 604057126.

It is a happy number.

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

It is a super-2 number, since 2×621750406² = 773147134722329672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621750403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1602256 + ... + 1602643.

It is an arithmetic number, because the mean of its divisors is an integer number (117780075).

Almost surely, 2^621750406 is an apocalyptic number.

621750406 is a deficient number, since it is larger than the sum of its proper divisors (320490194).

621750406 is a wasteful number, since it uses less digits than its factorization.

621750406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3204998.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 621750406 is about 24934.9234207767. The cubic root of 621750406 is about 853.5036037519.

The spelling of 621750406 in words is "six hundred twenty-one million, seven hundred fifty thousand, four hundred six".