1285787878 has 8 divisors (see below), whose sum is σ = 1943868672. Its totient is φ = 637831656.

The previous prime is 1285787869. The next prime is 1285787879. The reversal of 1285787878 is 8787875821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285787879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2530825 + ... + 2531332.

It is an arithmetic number, because the mean of its divisors is an integer number (242983584).

Almost surely, 2^1285787878 is an apocalyptic number.

1285787878 is a deficient number, since it is larger than the sum of its proper divisors (658080794).

1285787878 is a wasteful number, since it uses less digits than its factorization.

1285787878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5062286.

The product of its digits is 14049280, while the sum is 61.

The square root of 1285787878 is about 35857.8844607431. The cubic root of 1285787878 is about 1087.4011192608.

The spelling of 1285787878 in words is "one billion, two hundred eighty-five million, seven hundred eighty-seven thousand, eight hundred seventy-eight".