621647473 has 12 divisors (see below), whose sum is σ = 651887460. Its totient is φ = 592756736.

The previous prime is 621647447. The next prime is 621647497. The reversal of 621647473 is 374746126.

It can be written as a sum of positive squares in 2 ways, for example, as 247495824 + 374151649 = 15732^2 + 19343^2 .

It is a de Polignac number, because none of the positive numbers 2^k-621647473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621047473) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 185073 + ... + 188401.

It is an arithmetic number, because the mean of its divisors is an integer number (54323955).

Almost surely, 2^621647473 is an apocalyptic number.

It is an amenable number.

621647473 is a deficient number, since it is larger than the sum of its proper divisors (30239987).

621647473 is a wasteful number, since it uses less digits than its factorization.

621647473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3728 (or 3705 counting only the distinct ones).

The product of its digits is 169344, while the sum is 40.

The square root of 621647473 is about 24932.8593025349. The cubic root of 621647473 is about 853.4565009627.

The spelling of 621647473 in words is "six hundred twenty-one million, six hundred forty-seven thousand, four hundred seventy-three".