133278625 has 16 divisors (see below), whose sum is σ = 170833104. Its totient is φ = 103737600.

The previous prime is 133278553. The next prime is 133278631. The reversal of 133278625 is 526872331.

It can be written as a sum of positive squares in 8 ways, for example, as 844561 + 132434064 = 919^2 + 11508^2 .

It is not a de Polignac number, because 133278625 - 2¹⁵ = 133245857 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian 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, 9784 + ... + 19033.

It is an arithmetic number, because the mean of its divisors is an integer number (10677069).

Almost surely, 2^133278625 is an apocalyptic number.

It is an amenable number.

133278625 is a deficient number, since it is larger than the sum of its proper divisors (37554479).

133278625 is an equidigital number, since it uses as much as digits as its factorization.

133278625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28869 (or 28859 counting only the distinct ones).

The product of its digits is 60480, while the sum is 37.

The square root of 133278625 is about 11544.6362004179. The cubic root of 133278625 is about 510.8030728506.

It can be divided in two parts, 133278 and 625, that added together give a triangular number (133903 = T₅₁₇).

The spelling of 133278625 in words is "one hundred thirty-three million, two hundred seventy-eight thousand, six hundred twenty-five".