280940400 has 600 divisors, whose sum is σ = 1172112480. Its totient is φ = 63866880.

The previous prime is 280940399. The next prime is 280940467. The reversal of 280940400 is 4049082.

It is a tau number, because it is divible by the number of its divisors (600).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 9687586 + ... + 9687614.

Almost surely, 2^280940400 is an apocalyptic number.

280940400 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 280940400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (586056240).

280940400 is an abundant number, since it is smaller than the sum of its proper divisors (891172080).

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

280940400 is a wasteful number, since it uses less digits than its factorization.

280940400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95 (or 75 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 280940400 is about 16761.2768010077. The cubic root of 280940400 is about 654.9448509401.

Adding to 280940400 its reverse (4049082), we get a palindrome (284989482).

The spelling of 280940400 in words is "two hundred eighty million, nine hundred forty thousand, four hundred".