621649545 has 16 divisors (see below), whose sum is σ = 1085061312. Its totient is φ = 301405760.

The previous prime is 621649537. The next prime is 621649559. The reversal of 621649545 is 545946126.

It is not a de Polignac number, because 621649545 - 2³ = 621649537 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 621649497 and 621649506.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1883622 + ... + 1883951.

It is an arithmetic number, because the mean of its divisors is an integer number (67816332).

Almost surely, 2^621649545 is an apocalyptic number.

It is an amenable number.

621649545 is a deficient number, since it is larger than the sum of its proper divisors (463411767).

621649545 is a wasteful number, since it uses less digits than its factorization.

621649545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3767592.

The product of its digits is 259200, while the sum is 42.

The square root of 621649545 is about 24932.9008540924. The cubic root of 621649545 is about 853.4574491742.

The spelling of 621649545 in words is "six hundred twenty-one million, six hundred forty-nine thousand, five hundred forty-five".