1286724798 has 64 divisors (see below), whose sum is σ = 3061800000. Its totient is φ = 399117312.

The previous prime is 1286724793. The next prime is 1286724823. The reversal of 1286724798 is 8974276821.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1286724793) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73828 + ... + 89576.

It is an arithmetic number, because the mean of its divisors is an integer number (47840625).

Almost surely, 2^1286724798 is an apocalyptic number.

1286724798 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1286724798, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1530900000).

1286724798 is an abundant number, since it is smaller than the sum of its proper divisors (1775075202).

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

1286724798 is a wasteful number, since it uses less digits than its factorization.

1286724798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15866 (or 15860 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 54.

The square root of 1286724798 is about 35870.9464330118. The cubic root of 1286724798 is about 1087.6651753866.

The spelling of 1286724798 in words is "one billion, two hundred eighty-six million, seven hundred twenty-four thousand, seven hundred ninety-eight".