133879428 has 36 divisors (see below), whose sum is σ = 350089740. Its totient is φ = 43087296.

The previous prime is 133879423. The next prime is 133879433. The reversal of 133879428 is 824978331.

It is an interprime number because it is at equal distance from previous prime (133879423) and next prime (133879433).

It can be written as a sum of positive squares in 2 ways, for example, as 44916804 + 88962624 = 6702^2 + 9432^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (133879423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63075 + ... + 65162.

It is an arithmetic number, because the mean of its divisors is an integer number (9724715).

Almost surely, 2^133879428 is an apocalyptic number.

133879428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

133879428 is an abundant number, since it is smaller than the sum of its proper divisors (216210312).

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

133879428 is a wasteful number, since it uses less digits than its factorization.

133879428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128276 (or 128271 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 133879428 is about 11570.6278135631. The cubic root of 133879428 is about 511.5694673785.

The spelling of 133879428 in words is "one hundred thirty-three million, eight hundred seventy-nine thousand, four hundred twenty-eight".