280742055 has 32 divisors (see below), whose sum is σ = 501431040. Its totient is φ = 132948480.

The previous prime is 280742027. The next prime is 280742057. The reversal of 280742055 is 550247082.

It is not a de Polignac number, because 280742055 - 2⁶ = 280741991 is a prime.

It is a super-2 number, since 2×280742055² = 157632202891246050, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280742057) 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, 12690 + ... + 26879.

It is an arithmetic number, because the mean of its divisors is an integer number (15669720).

Almost surely, 2^280742055 is an apocalyptic number.

280742055 is a deficient number, since it is larger than the sum of its proper divisors (220688985).

280742055 is a wasteful number, since it uses less digits than its factorization.

280742055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39631.

The product of its (nonzero) digits is 22400, while the sum is 33.

The square root of 280742055 is about 16755.3589934683. The cubic root of 280742055 is about 654.7906834612.

The spelling of 280742055 in words is "two hundred eighty million, seven hundred forty-two thousand, fifty-five".