280070020 has 72 divisors (see below), whose sum is σ = 619068744. Its totient is φ = 106389504.

The previous prime is 280069997. The next prime is 280070033. The reversal of 280070020 is 20070082.

280070020 = T₇₉ + T₈₀ + ... + T₁₁₈₈.

It can be written as a sum of positive squares in 12 ways, for example, as 244036 + 279825984 = 494^2 + 16728^2 .

It is a super-2 number, since 2×280070020² = 156878432205600800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 280070020.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1451044 + ... + 1451236.

It is an arithmetic number, because the mean of its divisors is an integer number (8598177).

Almost surely, 2^280070020 is an apocalyptic number.

280070020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 280070020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (309534372).

280070020 is an abundant number, since it is smaller than the sum of its proper divisors (338998724).

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

280070020 is a wasteful number, since it uses less digits than its factorization.

280070020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329 (or 290 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 280070020 is about 16735.2926475757. The cubic root of 280070020 is about 654.2677908409.

The spelling of 280070020 in words is "two hundred eighty million, seventy thousand, twenty".