1284268840 has 32 divisors (see below), whose sum is σ = 2897385480. Its totient is φ = 512324352.

The previous prime is 1284268823. The next prime is 1284268873. The reversal of 1284268840 is 488624821.

It can be written as a sum of positive squares in 4 ways, for example, as 963357444 + 320911396 = 31038^2 + 17914^2 .

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, 28119 + ... + 57958.

Almost surely, 2^1284268840 is an apocalyptic number.

1284268840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1284268840 is an abundant number, since it is smaller than the sum of its proper divisors (1613116640).

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

1284268840 is a wasteful number, since it uses less digits than its factorization.

1284268840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86461 (or 86457 counting only the distinct ones).

The product of its (nonzero) digits is 196608, while the sum is 43.

The square root of 1284268840 is about 35836.6968343903. The cubic root of 1284268840 is about 1086.9727296431.

The spelling of 1284268840 in words is "one billion, two hundred eighty-four million, two hundred sixty-eight thousand, eight hundred forty".