133518978 has 48 divisors (see below), whose sum is σ = 296819640. Its totient is φ = 43360512.

The previous prime is 133518961. The next prime is 133518989. The reversal of 133518978 is 879815331.

It can be written as a sum of positive squares in 4 ways, for example, as 129345129 + 4173849 = 11373^2 + 2043^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 164638 + ... + 165446.

Almost surely, 2^133518978 is an apocalyptic number.

133518978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

133518978 is an abundant number, since it is smaller than the sum of its proper divisors (163300662).

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

133518978 is a wasteful number, since it uses less digits than its factorization.

133518978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1043 (or 1040 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 133518978 is about 11555.0412374859. The cubic root of 133518978 is about 511.1099470708.

The spelling of 133518978 in words is "one hundred thirty-three million, five hundred eighteen thousand, nine hundred seventy-eight".