280555242 has 64 divisors (see below), whose sum is σ = 641710080. Its totient is φ = 80942400.

The previous prime is 280555241. The next prime is 280555243. The reversal of 280555242 is 242555082.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (280555241) and next prime (280555243).

It is a super-2 number, since 2×280555242² = 157422487627357128, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (280555241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 638859 + ... + 639297.

It is an arithmetic number, because the mean of its divisors is an integer number (10026720).

Almost surely, 2^280555242 is an apocalyptic number.

280555242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 280555242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (320855040).

280555242 is an abundant number, since it is smaller than the sum of its proper divisors (361154838).

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

280555242 is a wasteful number, since it uses less digits than its factorization.

280555242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899.

The product of its (nonzero) digits is 32000, while the sum is 33.

The square root of 280555242 is about 16749.7833418824. The cubic root of 280555242 is about 654.6454130345.

The spelling of 280555242 in words is "two hundred eighty million, five hundred fifty-five thousand, two hundred forty-two".