621261428 has 24 divisors (see below), whose sum is σ = 1095134880. Its totient is φ = 308374560.

The previous prime is 621261427. The next prime is 621261439. The reversal of 621261428 is 824162126.

It is a junction number, because it is equal to n+sod(n) for n = 621261394 and 621261403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621261427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 405023 + ... + 406553.

It is an arithmetic number, because the mean of its divisors is an integer number (45630620).

Almost surely, 2^621261428 is an apocalyptic number.

It is an amenable number.

621261428 is a deficient number, since it is larger than the sum of its proper divisors (473873452).

621261428 is a wasteful number, since it uses less digits than its factorization.

621261428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2207 (or 2205 counting only the distinct ones).

The product of its digits is 9216, while the sum is 32.

The square root of 621261428 is about 24925.1164089558. The cubic root of 621261428 is about 853.2797980059.

The spelling of 621261428 in words is "six hundred twenty-one million, two hundred sixty-one thousand, four hundred twenty-eight".