280978433 has 2 divisors, whose sum is σ = 280978434. Its totient is φ = 280978432.

The previous prime is 280978421. The next prime is 280978487. The reversal of 280978433 is 334879082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 243609664 + 37368769 = 15608^2 + 6113^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280978433 is a prime.

It is a super-2 number, since 2×280978433² = 157897759622270978, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (280975433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140489216 + 140489217.

It is an arithmetic number, because the mean of its divisors is an integer number (140489217).

Almost surely, 2^280978433 is an apocalyptic number.

It is an amenable number.

280978433 is a deficient number, since it is larger than the sum of its proper divisors (1).

280978433 is an equidigital number, since it uses as much as digits as its factorization.

280978433 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 280978433 is about 16762.4113122188. The cubic root of 280978433 is about 654.9744045317.

The spelling of 280978433 in words is "two hundred eighty million, nine hundred seventy-eight thousand, four hundred thirty-three".