280144872 has 128 divisors (see below), whose sum is σ = 920160000. Its totient is φ = 77269248.

The previous prime is 280144867. The next prime is 280144897. The reversal of 280144872 is 278441082.

It is a super-2 number, since 2×280144872² = 156962298615792768, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40654 + ... + 47042.

It is an arithmetic number, because the mean of its divisors is an integer number (7188750).

Almost surely, 2^280144872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 280144872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (460080000).

280144872 is an abundant number, since it is smaller than the sum of its proper divisors (640015128).

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

280144872 is a wasteful number, since it uses less digits than its factorization.

280144872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6440 (or 6430 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 36.

The square root of 280144872 is about 16737.5288498631. The cubic root of 280144872 is about 654.3260725645.

The spelling of 280144872 in words is "two hundred eighty million, one hundred forty-four thousand, eight hundred seventy-two".