278578020 has 48 divisors (see below), whose sum is σ = 891451008. Its totient is φ = 63674880.

The previous prime is 278578007. The next prime is 278578049. The reversal of 278578020 is 20875872.

It is a self number, because there is not a number n which added to its sum of digits gives 278578020.

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, 331221 + ... + 332060.

It is an arithmetic number, because the mean of its divisors is an integer number (18571896).

Almost surely, 2^278578020 is an apocalyptic number.

278578020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

278578020 is an abundant number, since it is smaller than the sum of its proper divisors (612872988).

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

278578020 is a wasteful number, since it uses less digits than its factorization.

278578020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663300 (or 663298 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 39.

The square root of 278578020 is about 16690.6566677288. The cubic root of 278578020 is about 653.1039079443.

The spelling of 278578020 in words is "two hundred seventy-eight million, five hundred seventy-eight thousand, twenty".