133178820 has 24 divisors (see below), whose sum is σ = 372900864. Its totient is φ = 35514336.

The previous prime is 133178813. The next prime is 133178831. The reversal of 133178820 is 28871331.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1109764 + ... + 1109883.

It is an arithmetic number, because the mean of its divisors is an integer number (15537536).

Almost surely, 2^133178820 is an apocalyptic number.

133178820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133178820 is an abundant number, since it is smaller than the sum of its proper divisors (239722044).

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

133178820 is a wasteful number, since it uses less digits than its factorization.

133178820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2219659 (or 2219657 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 133178820 is about 11540.3128207168. The cubic root of 133178820 is about 510.6755369422.

The spelling of 133178820 in words is "one hundred thirty-three million, one hundred seventy-eight thousand, eight hundred twenty".