1098287478 has 64 divisors (see below), whose sum is σ = 2567808000. Its totient is φ = 347451552.

The previous prime is 1098287473. The next prime is 1098287479. The reversal of 1098287478 is 8747828901.

It is a happy number.

1098287478 is a `hidden beast` number, since 1 + 0 + 98 + 2 + 87 + 478 = 666.

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 (1098287471) 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, 86451 + ... + 98337.

It is an arithmetic number, because the mean of its divisors is an integer number (40122000).

Almost surely, 2^1098287478 is an apocalyptic number.

1098287478 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 1098287478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1283904000).

1098287478 is an abundant number, since it is smaller than the sum of its proper divisors (1469520522).

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

1098287478 is a wasteful number, since it uses less digits than its factorization.

1098287478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11986 (or 11980 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 54.

The square root of 1098287478 is about 33140.4206068662. The cubic root of 1098287478 is about 1031.7441395181.

The spelling of 1098287478 in words is "one billion, ninety-eight million, two hundred eighty-seven thousand, four hundred seventy-eight".