278473920 has 112 divisors (see below), whose sum is σ = 892747008. Its totient is φ = 73538560.

The previous prime is 278473913. The next prime is 278473933. The reversal of 278473920 is 29374872.

278473920 = T₁₁₇ + T₁₁₈ + ... + T₁₁₈₆.

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, 101365 + ... + 104075.

Almost surely, 2^278473920 is an apocalyptic number.

278473920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 278473920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (446373504).

278473920 is an abundant number, since it is smaller than the sum of its proper divisors (614273088).

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

278473920 is a wasteful number, since it uses less digits than its factorization.

278473920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2838 (or 2828 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 42.

The square root of 278473920 is about 16687.5378651256. The cubic root of 278473920 is about 653.0225464317.

The spelling of 278473920 in words is "two hundred seventy-eight million, four hundred seventy-three thousand, nine hundred twenty".