1285628988 has 48 divisors (see below), whose sum is σ = 3475324160. Its totient is φ = 362289024.

The previous prime is 1285628983. The next prime is 1285629041. The reversal of 1285628988 is 8898265821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285628983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98698 + ... + 110961.

Almost surely, 2^1285628988 is an apocalyptic number.

It is an amenable number.

1285628988 is an abundant number, since it is smaller than the sum of its proper divisors (2189695172).

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

1285628988 is a wasteful number, since it uses less digits than its factorization.

1285628988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209746 (or 209744 counting only the distinct ones).

The product of its digits is 4423680, while the sum is 57.

The square root of 1285628988 is about 35855.6688405055. The cubic root of 1285628988 is about 1087.3563258999.

It can be divided in two parts, 128562 and 8988, that added together give a triangular number (137550 = T₅₂₄).

The spelling of 1285628988 in words is "one billion, two hundred eighty-five million, six hundred twenty-eight thousand, nine hundred eighty-eight".