1028778629520 has 40 divisors (see below), whose sum is σ = 3189213752256. Its totient is φ = 274340967808.

The previous prime is 1028778629519. The next prime is 1028778629533. The reversal of 1028778629520 is 259268778201.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2143288572 + ... + 2143289051.

Almost surely, 2^{1028778629520} is an apocalyptic number.

1028778629520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1028778629520 is an abundant number, since it is smaller than the sum of its proper divisors (2160435122736).

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

1028778629520 is a wasteful number, since it uses less digits than its factorization.

1028778629520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4286577639 (or 4286577633 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 57.

The spelling of 1028778629520 in words is "one trillion, twenty-eight billion, seven hundred seventy-eight million, six hundred twenty-nine thousand, five hundred twenty".