278120645 has 8 divisors (see below), whose sum is σ = 364085280. Its totient is φ = 202269520.

The previous prime is 278120641. The next prime is 278120657. The reversal of 278120645 is 546021872.

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

It is not a de Polignac number, because 278120645 - 2² = 278120641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278120641) 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, 2528315 + ... + 2528424.

It is an arithmetic number, because the mean of its divisors is an integer number (45510660).

Almost surely, 2^278120645 is an apocalyptic number.

It is an amenable number.

278120645 is a deficient number, since it is larger than the sum of its proper divisors (85964635).

278120645 is a wasteful number, since it uses less digits than its factorization.

278120645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5056755.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 278120645 is about 16676.9495112266. The cubic root of 278120645 is about 652.7462857755.

The spelling of 278120645 in words is "two hundred seventy-eight million, one hundred twenty thousand, six hundred forty-five".