278844064678 has 16 divisors (see below), whose sum is σ = 437846016096. Its totient is φ = 132934127040.

The previous prime is 278844064673. The next prime is 278844064691. The reversal of 278844064678 is 876460448872.

It is a super-2 number, since 2×278844064678² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278844064673) 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, 9669033 + ... + 9697828.

It is an arithmetic number, because the mean of its divisors is an integer number (27365376006).

Almost surely, 2^278844064678 is an apocalyptic number.

278844064678 is a deficient number, since it is larger than the sum of its proper divisors (159001951418).

278844064678 is a wasteful number, since it uses less digits than its factorization.

278844064678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19367199.

The product of its (nonzero) digits is 115605504, while the sum is 64.

The spelling of 278844064678 in words is "two hundred seventy-eight billion, eight hundred forty-four million, sixty-four thousand, six hundred seventy-eight".