209628453904 has 45 divisors (see below), whose sum is σ = 420750021757. Its totient is φ = 101174303552.

The previous prime is 209628453871. The next prime is 209628453941. The reversal of 209628453904 is 409354826902.

The square root of 209628453904 is 457852.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 109924076304 + 99704377600 = 331548^2 + 315760^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 53108859 + ... + 53112805.

Almost surely, 2^209628453904 is an apocalyptic number.

209628453904 is the 457852-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209628453904

209628453904 is an abundant number, since it is smaller than the sum of its proper divisors (211121567853).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209628453904 is an frugal number, since it uses more digits than its factorization.

209628453904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7960 (or 3978 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 52.

The spelling of 209628453904 in words is "two hundred nine billion, six hundred twenty-eight million, four hundred fifty-three thousand, nine hundred four".