278955640 has 32 divisors (see below), whose sum is σ = 649296000. Its totient is φ = 107734144.

The previous prime is 278955629. The next prime is 278955643. The reversal of 278955640 is 46559872.

278955640 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278955643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119080 + ... + 121399.

It is an arithmetic number, because the mean of its divisors is an integer number (20290500).

Almost surely, 2^278955640 is an apocalyptic number.

278955640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

278955640 is an abundant number, since it is smaller than the sum of its proper divisors (370340360).

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

278955640 is a wasteful number, since it uses less digits than its factorization.

278955640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240519 (or 240515 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 46.

The square root of 278955640 is about 16701.9651538374. The cubic root of 278955640 is about 653.3988746780.

The spelling of 278955640 in words is "two hundred seventy-eight million, nine hundred fifty-five thousand, six hundred forty".