1285535280 has 80 divisors (see below), whose sum is σ = 4113736704. Its totient is φ = 331749120.

The previous prime is 1285535261. The next prime is 1285535281. The reversal of 1285535280 is 825355821.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1285535280² = 3305201912249356800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1285535281) 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, 78954 + ... + 93833.

Almost surely, 2^1285535280 is an apocalyptic number.

1285535280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1285535280 is an abundant number, since it is smaller than the sum of its proper divisors (2828201424).

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

1285535280 is a wasteful number, since it uses less digits than its factorization.

1285535280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172834 (or 172828 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 39.

The square root of 1285535280 is about 35854.3620777166. The cubic root of 1285535280 is about 1087.3299065458.

The spelling of 1285535280 in words is "one billion, two hundred eighty-five million, five hundred thirty-five thousand, two hundred eighty".