280748938 has 4 divisors (see below), whose sum is σ = 421123410. Its totient is φ = 140374468.

The previous prime is 280748917. The next prime is 280748939. The reversal of 280748938 is 839847082.

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

It can be written as a sum of positive squares in only one way, i.e., 194686209 + 86062729 = 13953^2 + 9277^2 .

It is a junction number, because it is equal to n+sod(n) for n = 280748891 and 280748900.

It is not an unprimeable number, because it can be changed into a prime (280748939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70187233 + ... + 70187236.

Almost surely, 2^280748938 is an apocalyptic number.

280748938 is a deficient number, since it is larger than the sum of its proper divisors (140374472).

280748938 is a wasteful number, since it uses less digits than its factorization.

280748938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140374471.

The product of its (nonzero) digits is 774144, while the sum is 49.

The square root of 280748938 is about 16755.5643891813. The cubic root of 280748938 is about 654.7960346218.

The spelling of 280748938 in words is "two hundred eighty million, seven hundred forty-eight thousand, nine hundred thirty-eight".