280520164 has 6 divisors (see below), whose sum is σ = 490910294. Its totient is φ = 140260080.

The previous prime is 280520143. The next prime is 280520173. The reversal of 280520164 is 461025082.

It can be written as a sum of positive squares in only one way, i.e., 279892900 + 627264 = 16730^2 + 792^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 35065017 + ... + 35065024.

Almost surely, 2^280520164 is an apocalyptic number.

It is an amenable number.

280520164 is a deficient number, since it is larger than the sum of its proper divisors (210390130).

280520164 is a wasteful number, since it uses less digits than its factorization.

280520164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70130045 (or 70130043 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 280520164 is about 16748.7361911280. The cubic root of 280520164 is about 654.6181283201.

The spelling of 280520164 in words is "two hundred eighty million, five hundred twenty thousand, one hundred sixty-four".