133781284 has 24 divisors (see below), whose sum is σ = 288145088. Its totient is φ = 52924320.

The previous prime is 133781273. The next prime is 133781287. The reversal of 133781284 is 482187331.

It is not an unprimeable number, because it can be changed into a prime (133781287) 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, 183402 + ... + 184129.

Almost surely, 2^133781284 is an apocalyptic number.

133781284 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

133781284 is an abundant number, since it is smaller than the sum of its proper divisors (154363804).

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

133781284 is a wasteful number, since it uses less digits than its factorization.

133781284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367555 (or 367553 counting only the distinct ones).

The product of its digits is 32256, while the sum is 37.

The square root of 133781284 is about 11566.3859524054. The cubic root of 133781284 is about 511.4444301262. Note that the first 4 decimals are identical.

It can be divided in two parts, 1337 and 81284, that added together give a triangular number (82621 = T₄₀₆).

The spelling of 133781284 in words is "one hundred thirty-three million, seven hundred eighty-one thousand, two hundred eighty-four".