201209947928 has 64 divisors (see below), whose sum is σ = 412897595040. Its totient is φ = 91163520000.

The previous prime is 201209947903. The next prime is 201209948021. The reversal of 201209947928 is 829749902102.

It is a self number, because there is not a number n which added to its sum of digits gives 201209947928.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84505298 + ... + 84507678.

Almost surely, 2^201209947928 is an apocalyptic number.

It is an amenable number.

201209947928 is an abundant number, since it is smaller than the sum of its proper divisors (211687647112).

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

201209947928 is a wasteful number, since it uses less digits than its factorization.

201209947928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5100 (or 5096 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 53.

The spelling of 201209947928 in words is "two hundred one billion, two hundred nine million, nine hundred forty-seven thousand, nine hundred twenty-eight".