1284011880 has 64 divisors (see below), whose sum is σ = 3869087040. Its totient is φ = 340887552.

The previous prime is 1284011873. The next prime is 1284011891. The reversal of 1284011880 is 881104821.

It is a super-2 number, since 2×1284011880² = 3297373015962268800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3672 + ... + 50808.

It is an arithmetic number, because the mean of its divisors is an integer number (60454485).

Almost surely, 2^1284011880 is an apocalyptic number.

1284011880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1284011880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1934543520).

1284011880 is an abundant number, since it is smaller than the sum of its proper divisors (2585075160).

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

1284011880 is a wasteful number, since it uses less digits than its factorization.

1284011880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47378 (or 47374 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 33.

The square root of 1284011880 is about 35833.1115031893. Note that the first 3 decimals coincide. The cubic root of 1284011880 is about 1086.9002299882.

The spelling of 1284011880 in words is "one billion, two hundred eighty-four million, eleven thousand, eight hundred eighty".