621428 has 12 divisors (see below), whose sum is σ = 1093092. Its totient is φ = 309120.

The previous prime is 621427. The next prime is 621431. The reversal of 621428 is 824126.

It can be written as a sum of positive squares in 2 ways, for example, as 183184 + 438244 = 428^2 + 662^2 .

It is a plaindrome in base 14.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 621428.

It is not an unprimeable number, because it can be changed into a prime (621427) 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, 1118 + ... + 1578.

It is an arithmetic number, because the mean of its divisors is an integer number (91091).

2⁶²¹⁴²⁸ is an apocalyptic number.

It is an amenable number.

621428 is a deficient number, since it is larger than the sum of its proper divisors (471664).

621428 is a wasteful number, since it uses less digits than its factorization.

621428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802 (or 800 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

The square root of 621428 is about 788.3070467781. The cubic root of 621428 is about 85.3356051370.

The spelling of 621428 in words is "six hundred twenty-one thousand, four hundred twenty-eight".