128287980 has 36 divisors (see below), whose sum is σ = 389140752. Its totient is φ = 34210080.

The previous prime is 128287969. The next prime is 128287993. The reversal of 128287980 is 89782821.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 356176 + ... + 356535.

Almost surely, 2^128287980 is an apocalyptic number.

128287980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128287980 is an abundant number, since it is smaller than the sum of its proper divisors (260852772).

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

128287980 is a wasteful number, since it uses less digits than its factorization.

128287980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712726 (or 712721 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The square root of 128287980 is about 11326.4283867422. The cubic root of 128287980 is about 504.3460869354.

The spelling of 128287980 in words is "one hundred twenty-eight million, two hundred eighty-seven thousand, nine hundred eighty".