1285896720 has 40 divisors (see below), whose sum is σ = 3986280576. Its totient is φ = 342905728.

The previous prime is 1285896707. The next prime is 1285896727. The reversal of 1285896720 is 276985821.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 1285896720.

It is not an unprimeable number, because it can be changed into a prime (1285896727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2678712 + ... + 2679191.

Almost surely, 2^1285896720 is an apocalyptic number.

1285896720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1285896720 is an abundant number, since it is smaller than the sum of its proper divisors (2700383856).

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

1285896720 is a wasteful number, since it uses less digits than its factorization.

1285896720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5357919 (or 5357913 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 48.

The square root of 1285896720 is about 35859.4021143688. The cubic root of 1285896720 is about 1087.4318012458.

The spelling of 1285896720 in words is "one billion, two hundred eighty-five million, eight hundred ninety-six thousand, seven hundred twenty".