280640898 has 12 divisors (see below), whose sum is σ = 608055318. Its totient is φ = 93546960.

The previous prime is 280640897. The next prime is 280640903. The reversal of 280640898 is 898046082.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 278122329 + 2518569 = 16677^2 + 1587^2 .

It is not an unprimeable number, because it can be changed into a prime (280640897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7795563 + ... + 7795598.

Almost surely, 2^280640898 is an apocalyptic number.

280640898 is an abundant number, since it is smaller than the sum of its proper divisors (327414420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

280640898 is a wasteful number, since it uses less digits than its factorization.

280640898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15591169 (or 15591166 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The square root of 280640898 is about 16752.3400753447. The cubic root of 280640898 is about 654.7120292695.

The spelling of 280640898 in words is "two hundred eighty million, six hundred forty thousand, eight hundred ninety-eight".