75780378 has 12 divisors (see below), whose sum is σ = 164190858. Its totient is φ = 25260120.

The previous prime is 75780371. The next prime is 75780391. The reversal of 75780378 is 87308757.

75780378 is a `hidden beast` number, since 7 + 578 + 0 + 3 + 78 = 666.

It can be written as a sum of positive squares in only one way, i.e., 68013009 + 7767369 = 8247^2 + 2787^2 .

It is not an unprimeable number, because it can be changed into a prime (75780371) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2104993 + ... + 2105028.

Almost surely, 2^75780378 is an apocalyptic number.

75780378 is an abundant number, since it is smaller than the sum of its proper divisors (88410480).

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

75780378 is a wasteful number, since it uses less digits than its factorization.

75780378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4210029 (or 4210026 counting only the distinct ones).

The product of its (nonzero) digits is 329280, while the sum is 45.

The square root of 75780378 is about 8705.1925883348. The cubic root of 75780378 is about 423.1739472040.

The spelling of 75780378 in words is "seventy-five million, seven hundred eighty thousand, three hundred seventy-eight".