278742251 has 8 divisors (see below), whose sum is σ = 299183184. Its totient is φ = 258750720.

The previous prime is 278742241. The next prime is 278742253. The reversal of 278742251 is 152247872.

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 278742251 - 2⁶ = 278742187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (278742253) 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, 111065 + ... + 113546.

It is an arithmetic number, because the mean of its divisors is an integer number (37397898).

Almost surely, 2^278742251 is an apocalyptic number.

278742251 is a deficient number, since it is larger than the sum of its proper divisors (20440933).

278742251 is a wasteful number, since it uses less digits than its factorization.

278742251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224701.

The product of its digits is 62720, while the sum is 38.

The square root of 278742251 is about 16695.5757912089. The cubic root of 278742251 is about 653.2322248840.

The spelling of 278742251 in words is "two hundred seventy-eight million, seven hundred forty-two thousand, two hundred fifty-one".