280400010 has 64 divisors (see below), whose sum is σ = 737800704. Its totient is φ = 67636800.

The previous prime is 280399997. The next prime is 280400011. The reversal of 280400010 is 10004082.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (280400011) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 67617 + ... + 71643.

It is an arithmetic number, because the mean of its divisors is an integer number (11528136).

Almost surely, 2^280400010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 280400010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (368900352).

280400010 is an abundant number, since it is smaller than the sum of its proper divisors (457400694).

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

280400010 is a wasteful number, since it uses less digits than its factorization.

280400010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4259.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 280400010 is about 16745.1488497415. The cubic root of 280400010 is about 654.5246517133.

Adding to 280400010 its reverse (10004082), we get a palindrome (290404092).

The spelling of 280400010 in words is "two hundred eighty million, four hundred thousand, ten".