278401642 has 8 divisors (see below), whose sum is σ = 439581600. Its totient is φ = 131874444.

The previous prime is 278401631. The next prime is 278401657. The reversal of 278401642 is 246104872.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 278401598 and 278401607.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3663142 + ... + 3663217.

It is an arithmetic number, because the mean of its divisors is an integer number (54947700).

Almost surely, 2^278401642 is an apocalyptic number.

278401642 is a deficient number, since it is larger than the sum of its proper divisors (161179958).

278401642 is a wasteful number, since it uses less digits than its factorization.

278401642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7326380.

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 278401642 is about 16685.3720965401. The cubic root of 278401642 is about 652.9660441355.

The spelling of 278401642 in words is "two hundred seventy-eight million, four hundred one thousand, six hundred forty-two".