102111780828 has 12 divisors (see below), whose sum is σ = 238260821960. Its totient is φ = 34037260272.

The previous prime is 102111780677. The next prime is 102111780851. The reversal of 102111780828 is 828087111201.

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

It is a congruent number.

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, 4254657523 + ... + 4254657546.

Almost surely, 2^102111780828 is an apocalyptic number.

It is an amenable number.

102111780828 is an abundant number, since it is smaller than the sum of its proper divisors (136149041132).

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

102111780828 is a wasteful number, since it uses less digits than its factorization.

102111780828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8509315076 (or 8509315074 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 39.

The spelling of 102111780828 in words is "one hundred two billion, one hundred eleven million, seven hundred eighty thousand, eight hundred twenty-eight".