1245065856 has 128 divisors (see below), whose sum is σ = 3542745600. Its totient is φ = 386039808.

The previous prime is 1245065837. The next prime is 1245065863. The reversal of 1245065856 is 6585605421.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 579921 + ... + 582063.

It is an arithmetic number, because the mean of its divisors is an integer number (27677700).

Almost surely, 2^1245065856 is an apocalyptic number.

1245065856 is a gapful number since it is divisible by the number (16) 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 1245065856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1771372800).

1245065856 is an abundant number, since it is smaller than the sum of its proper divisors (2297679744).

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

1245065856 is a wasteful number, since it uses less digits than its factorization.

1245065856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2266 (or 2254 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 42.

The square root of 1245065856 is about 35285.4907291935. The cubic root of 1245065856 is about 1075.7981038440.

The spelling of 1245065856 in words is "one billion, two hundred forty-five million, sixty-five thousand, eight hundred fifty-six".