1285621848 has 256 divisors, whose sum is σ = 4242585600. Its totient is φ = 353134080.

The previous prime is 1285621819. The next prime is 1285621849. The reversal of 1285621848 is 8481265821.

1285621848 is a `hidden beast` number, since 1 + 2 + 8 + 562 + 1 + 84 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285621849) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4888165 + ... + 4888427.

It is an arithmetic number, because the mean of its divisors is an integer number (16572600).

Almost surely, 2^1285621848 is an apocalyptic number.

1285621848 is a gapful number since it is divisible by the number (18) 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 1285621848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2121292800).

1285621848 is an abundant number, since it is smaller than the sum of its proper divisors (2956963752).

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

1285621848 is a wasteful number, since it uses less digits than its factorization.

1285621848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399 (or 389 counting only the distinct ones).

The product of its digits is 245760, while the sum is 45.

The square root of 1285621848 is about 35855.5692745214. The cubic root of 1285621848 is about 1087.3543129452.

The spelling of 1285621848 in words is "one billion, two hundred eighty-five million, six hundred twenty-one thousand, eight hundred forty-eight".