280120707 has 12 divisors (see below), whose sum is σ = 415122520. Its totient is φ = 186689160.

The previous prime is 280120699. The next prime is 280120717. The reversal of 280120707 is 707021082.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 280120707 - 2³ = 280120699 is a prime.

It is a super-2 number, since 2×280120707² = 156935220980359698, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280120717) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85357 + ... + 88577.

Almost surely, 2^280120707 is an apocalyptic number.

280120707 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

280120707 is a deficient number, since it is larger than the sum of its proper divisors (135001813).

280120707 is an frugal number, since it uses more digits than its factorization.

280120707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6451 (or 3224 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 280120707 is about 16736.8069535381. The cubic root of 280120707 is about 654.3072581988.

Multiplying 280120707 by its sum of digits (27), we get a square (7563259089 = 86967²).

280120707 divided by its sum of digits (27) gives a square (10374841 = 3221²).

Adding to 280120707 its reverse (707021082), we get a palindrome (987141789).

The spelling of 280120707 in words is "two hundred eighty million, one hundred twenty thousand, seven hundred seven".