280478376 has 256 divisors, whose sum is σ = 892684800. Its totient is φ = 82114560.

The previous prime is 280478371. The next prime is 280478377. The reversal of 280478376 is 673874082.

It is a happy number.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (280478371) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 6840916 + ... + 6840956.

It is an arithmetic number, because the mean of its divisors is an integer number (3487050).

Almost surely, 2^280478376 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 280478376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (446342400).

280478376 is an abundant number, since it is smaller than the sum of its proper divisors (612206424).

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

280478376 is a wasteful number, since it uses less digits than its factorization.

280478376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108 (or 86 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 45.

The square root of 280478376 is about 16747.4886475555. The cubic root of 280478376 is about 654.5856213987.

The spelling of 280478376 in words is "two hundred eighty million, four hundred seventy-eight thousand, three hundred seventy-six".