280431478 has 4 divisors (see below), whose sum is σ = 420647220. Its totient is φ = 140215738.

The previous prime is 280431467. The next prime is 280431491. The reversal of 280431478 is 874134082.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70107868 + ... + 70107871.

It is an arithmetic number, because the mean of its divisors is an integer number (105161805).

Almost surely, 2^280431478 is an apocalyptic number.

280431478 is a deficient number, since it is larger than the sum of its proper divisors (140215742).

280431478 is a wasteful number, since it uses less digits than its factorization.

280431478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140215741.

The product of its (nonzero) digits is 43008, while the sum is 37.

The square root of 280431478 is about 16746.0884387967. The cubic root of 280431478 is about 654.5491355585.

The spelling of 280431478 in words is "two hundred eighty million, four hundred thirty-one thousand, four hundred seventy-eight".