278548461 has 12 divisors (see below), whose sum is σ = 410908992. Its totient is φ = 181747656.

The previous prime is 278548447. The next prime is 278548463. The reversal of 278548461 is 164845872.

It is not a de Polignac number, because 278548461 - 2⁵ = 278548429 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278548463) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 328831 + ... + 329676.

It is an arithmetic number, because the mean of its divisors is an integer number (34242416).

Almost surely, 2^278548461 is an apocalyptic number.

It is an amenable number.

278548461 is a deficient number, since it is larger than the sum of its proper divisors (132360531).

278548461 is a wasteful number, since it uses less digits than its factorization.

278548461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658560 (or 658557 counting only the distinct ones).

The product of its digits is 430080, while the sum is 45.

The square root of 278548461 is about 16689.7711488205. The cubic root of 278548461 is about 653.0808075560.

It can be divided in two parts, 27854 and 8461, that added together give a triangular number (36315 = T₂₆₉).

The spelling of 278548461 in words is "two hundred seventy-eight million, five hundred forty-eight thousand, four hundred sixty-one".