278796345 has 32 divisors (see below), whose sum is σ = 474139008. Its totient is φ = 139404288.

The previous prime is 278796337. The next prime is 278796347. The reversal of 278796345 is 543697872.

It is not a de Polignac number, because 278796345 - 2³ = 278796337 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (278796347) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68662 + ... + 72608.

It is an arithmetic number, because the mean of its divisors is an integer number (14816844).

Almost surely, 2^278796345 is an apocalyptic number.

It is an amenable number.

278796345 is a deficient number, since it is larger than the sum of its proper divisors (195342663).

278796345 is a wasteful number, since it uses less digits than its factorization.

278796345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4249.

The product of its digits is 2540160, while the sum is 51.

The square root of 278796345 is about 16697.1957226356. The cubic root of 278796345 is about 653.2744785650.

The spelling of 278796345 in words is "two hundred seventy-eight million, seven hundred ninety-six thousand, three hundred forty-five".