278479451 has 4 divisors (see below), whose sum is σ = 282294312. Its totient is φ = 274664592.

The previous prime is 278479441. The next prime is 278479459. The reversal of 278479451 is 154974872.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 278479451 - 2⁶ = 278479387 is a prime.

It is a super-2 number, since 2×278479451² = 155101609258522802, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 278479396 and 278479405.

It is not an unprimeable number, because it can be changed into a prime (278479459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1907321 + ... + 1907466.

It is an arithmetic number, because the mean of its divisors is an integer number (70573578).

Almost surely, 2^278479451 is an apocalyptic number.

278479451 is a deficient number, since it is larger than the sum of its proper divisors (3814861).

278479451 is an equidigital number, since it uses as much as digits as its factorization.

278479451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3814860.

The product of its digits is 564480, while the sum is 47.

The square root of 278479451 is about 16687.7035867731. The cubic root of 278479451 is about 653.0268698094.

The spelling of 278479451 in words is "two hundred seventy-eight million, four hundred seventy-nine thousand, four hundred fifty-one".