1213871628 has 12 divisors (see below), whose sum is σ = 2832367160. Its totient is φ = 404623872.

The previous prime is 1213871599. The next prime is 1213871653. The reversal of 1213871628 is 8261783121.

It is a tau number, because it is divible by the number of its divisors (12).

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, 50577973 + ... + 50577996.

Almost surely, 2^1213871628 is an apocalyptic number.

It is an amenable number.

1213871628 is an abundant number, since it is smaller than the sum of its proper divisors (1618495532).

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

1213871628 is a wasteful number, since it uses less digits than its factorization.

1213871628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101155976 (or 101155974 counting only the distinct ones).

The product of its digits is 32256, while the sum is 39.

The square root of 1213871628 is about 34840.6605563098. The cubic root of 1213871628 is about 1066.7375599149.

The spelling of 1213871628 in words is "one billion, two hundred thirteen million, eight hundred seventy-one thousand, six hundred twenty-eight".