1285249770 has 96 divisors (see below), whose sum is σ = 3942282240. Its totient is φ = 284290560.

The previous prime is 1285249751. The next prime is 1285249783. The reversal of 1285249770 is 779425821.

It is a happy number.

1285249770 is a `hidden beast` number, since 12 + 85 + 2 + 497 + 70 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13375 + ... + 52434.

It is an arithmetic number, because the mean of its divisors is an integer number (41065440).

Almost surely, 2^1285249770 is an apocalyptic number.

1285249770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1285249770 is an abundant number, since it is smaller than the sum of its proper divisors (2657032470).

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

1285249770 is a wasteful number, since it uses less digits than its factorization.

1285249770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65860 (or 65857 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The square root of 1285249770 is about 35850.3803327106. The cubic root of 1285249770 is about 1087.2494040107.

The spelling of 1285249770 in words is "one billion, two hundred eighty-five million, two hundred forty-nine thousand, seven hundred seventy".