278561064 has 32 divisors (see below), whose sum is σ = 697324320. Its totient is φ = 92730816.

The previous prime is 278561051. The next prime is 278561069. The reversal of 278561064 is 460165872.

It is not an unprimeable number, because it can be changed into a prime (278561069) 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, 11847 + ... + 26409.

It is an arithmetic number, because the mean of its divisors is an integer number (21791385).

Almost surely, 2^278561064 is an apocalyptic number.

278561064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

278561064 is an abundant number, since it is smaller than the sum of its proper divisors (418763256).

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

278561064 is a wasteful number, since it uses less digits than its factorization.

278561064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15369 (or 15365 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 278561064 is about 16690.1487111410. The cubic root of 278561064 is about 653.0906570131.

It can be divided in two parts, 27856 and 1064, that added together give a triangular number (28920 = T₂₄₀).

The spelling of 278561064 in words is "two hundred seventy-eight million, five hundred sixty-one thousand, sixty-four".