133778375 has 16 divisors (see below), whose sum is σ = 170844960. Its totient is φ = 104529600.

The previous prime is 133778339. The next prime is 133778387. The reversal of 133778375 is 573877331.

It is not a de Polignac number, because 133778375 - 2¹⁰ = 133777351 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7070 + ... + 17819.

It is an arithmetic number, because the mean of its divisors is an integer number (10677810).

Almost surely, 2^133778375 is an apocalyptic number.

133778375 is a deficient number, since it is larger than the sum of its proper divisors (37066585).

133778375 is an equidigital number, since it uses as much as digits as its factorization.

133778375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24947 (or 24937 counting only the distinct ones).

The product of its digits is 370440, while the sum is 44.

The square root of 133778375 is about 11566.2601993903. The cubic root of 133778375 is about 511.4407230739.

The spelling of 133778375 in words is "one hundred thirty-three million, seven hundred seventy-eight thousand, three hundred seventy-five".