278452045 has 8 divisors (see below), whose sum is σ = 334709496. Its totient is φ = 222383616.

The previous prime is 278452043. The next prime is 278452073. The reversal of 278452045 is 540254872.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 55785961 + 222666084 = 7469^2 + 14922^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 278452045 - 2¹ = 278452043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 278451995 and 278452013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278452043) 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, 43992 + ... + 49921.

It is an arithmetic number, because the mean of its divisors is an integer number (41838687).

Almost surely, 2^278452045 is an apocalyptic number.

It is an amenable number.

278452045 is a deficient number, since it is larger than the sum of its proper divisors (56257451).

278452045 is an equidigital number, since it uses as much as digits as its factorization.

278452045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94511.

The product of its (nonzero) digits is 89600, while the sum is 37.

The square root of 278452045 is about 16686.8824230292. The cubic root of 278452045 is about 653.0054469941.

It can be divided in two parts, 27845 and 2045, that added together give a triangular number (29890 = T₂₄₄).

The spelling of 278452045 in words is "two hundred seventy-eight million, four hundred fifty-two thousand, forty-five".