280978487 has 2 divisors, whose sum is σ = 280978488. Its totient is φ = 280978486.

The previous prime is 280978433. The next prime is 280978507. The reversal of 280978487 is 784879082.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 280978487 - 2⁸ = 280978231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280908487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140489243 + 140489244.

It is an arithmetic number, because the mean of its divisors is an integer number (140489244).

Almost surely, 2^280978487 is an apocalyptic number.

280978487 is a deficient number, since it is larger than the sum of its proper divisors (1).

280978487 is an equidigital number, since it uses as much as digits as its factorization.

280978487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1806336, while the sum is 53.

The square root of 280978487 is about 16762.4129229655. The cubic root of 280978487 is about 654.9744464906.

The spelling of 280978487 in words is "two hundred eighty million, nine hundred seventy-eight thousand, four hundred eighty-seven".