621890 has 8 divisors (see below), whose sum is σ = 1119420. Its totient is φ = 248752.

The previous prime is 621883. The next prime is 621893. The reversal of 621890 is 98126.

621890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 573049 + 48841 = 757^2 + 221^2 .

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

It is not an unprimeable number, because it can be changed into a prime (621893) 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, 31085 + ... + 31104.

2⁶²¹⁸⁹⁰ is an apocalyptic number.

621890 is a deficient number, since it is larger than the sum of its proper divisors (497530).

621890 is a wasteful number, since it uses less digits than its factorization.

621890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62196.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 621890 is about 788.6000253614. The cubic root of 621890 is about 85.3567474541.

The spelling of 621890 in words is "six hundred twenty-one thousand, eight hundred ninety".