278920023 has 16 divisors (see below), whose sum is σ = 382427136. Its totient is φ = 180692640.

The previous prime is 278920009. The next prime is 278920049. The reversal of 278920023 is 320029872.

It is not a de Polignac number, because 278920023 - 2²² = 274725719 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278927023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166890 + ... + 168552.

It is an arithmetic number, because the mean of its divisors is an integer number (23901696).

Almost surely, 2^278920023 is an apocalyptic number.

278920023 is a deficient number, since it is larger than the sum of its proper divisors (103507113).

278920023 is a wasteful number, since it uses less digits than its factorization.

278920023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3214.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 278920023 is about 16700.8988680250. The cubic root of 278920023 is about 653.3710648820.

Adding to 278920023 its reverse (320029872), we get a palindrome (598949895).

The spelling of 278920023 in words is "two hundred seventy-eight million, nine hundred twenty thousand, twenty-three".