280052388 has 144 divisors (see below), whose sum is σ = 911339520. Its totient is φ = 70372800.

The previous prime is 280052387. The next prime is 280052401. The reversal of 280052388 is 883250082.

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

It is not an unprimeable number, because it can be changed into a prime (280052387) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 84303 + ... + 87561.

Almost surely, 2^280052388 is an apocalyptic number.

280052388 is a gapful number since it is divisible by the number (28) 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 280052388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (455669760).

280052388 is an abundant number, since it is smaller than the sum of its proper divisors (631287132).

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

280052388 is a wasteful number, since it uses less digits than its factorization.

280052388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3318 (or 3313 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 280052388 is about 16734.7658483768. The cubic root of 280052388 is about 654.2540605938.

The spelling of 280052388 in words is "two hundred eighty million, fifty-two thousand, three hundred eighty-eight".