278730969 has 16 divisors (see below), whose sum is σ = 426766080. Its totient is φ = 160036560.

The previous prime is 278730967. The next prime is 278730979. The reversal of 278730969 is 969037872.

It is not a de Polignac number, because 278730969 - 2¹ = 278730967 is a prime.

It is a super-2 number, since 2×278730969² = 155381906159357922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (278730967) 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 15 ways as a sum of consecutive naturals, for example, 221647 + ... + 222900.

It is an arithmetic number, because the mean of its divisors is an integer number (26672880).

Almost surely, 2^278730969 is an apocalyptic number.

It is an amenable number.

278730969 is a deficient number, since it is larger than the sum of its proper divisors (148035111).

278730969 is a wasteful number, since it uses less digits than its factorization.

278730969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444580.

The product of its (nonzero) digits is 1143072, while the sum is 51.

The square root of 278730969 is about 16695.2379138484. The cubic root of 278730969 is about 653.2234116461.

The spelling of 278730969 in words is "two hundred seventy-eight million, seven hundred thirty thousand, nine hundred sixty-nine".