280778132 has 12 divisors (see below), whose sum is σ = 502789056. Its totient is φ = 137124120.

The previous prime is 280778117. The next prime is 280778149. The reversal of 280778132 is 231877082.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 816044 + ... + 816387.

It is an arithmetic number, because the mean of its divisors is an integer number (41899088).

Almost surely, 2^280778132 is an apocalyptic number.

It is an amenable number.

280778132 is a deficient number, since it is larger than the sum of its proper divisors (222010924).

280778132 is a wasteful number, since it uses less digits than its factorization.

280778132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632478 (or 1632476 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 280778132 is about 16756.4355398157. The cubic root of 280778132 is about 654.8187304071.

The spelling of 280778132 in words is "two hundred eighty million, seven hundred seventy-eight thousand, one hundred thirty-two".