621674545 has 4 divisors (see below), whose sum is σ = 746009460. Its totient is φ = 497339632.

The previous prime is 621674533. The next prime is 621674587. The reversal of 621674545 is 545476126.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 236298384 + 385376161 = 15372^2 + 19631^2 .

It is a cyclic number.

It is not a de Polignac number, because 621674545 - 2¹⁷ = 621543473 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 621674498 and 621674507.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62167450 + ... + 62167459.

It is an arithmetic number, because the mean of its divisors is an integer number (186502365).

Almost surely, 2^621674545 is an apocalyptic number.

It is an amenable number.

621674545 is a deficient number, since it is larger than the sum of its proper divisors (124334915).

621674545 is a wasteful number, since it uses less digits than its factorization.

621674545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124334914.

The product of its digits is 201600, while the sum is 40.

The square root of 621674545 is about 24933.4021946464. The cubic root of 621674545 is about 853.4688897843.

The spelling of 621674545 in words is "six hundred twenty-one million, six hundred seventy-four thousand, five hundred forty-five".