280987742 has 8 divisors (see below), whose sum is σ = 481693296. Its totient is φ = 120423312.

The previous prime is 280987741. The next prime is 280987769. The reversal of 280987742 is 247789082.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×280987742² = 157908222308517128, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280987741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10035263 + ... + 10035290.

It is an arithmetic number, because the mean of its divisors is an integer number (60211662).

Almost surely, 2^280987742 is an apocalyptic number.

280987742 is a deficient number, since it is larger than the sum of its proper divisors (200705554).

280987742 is a wasteful number, since it uses less digits than its factorization.

280987742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20070562.

The product of its (nonzero) digits is 451584, while the sum is 47.

The square root of 280987742 is about 16762.6889847661. The cubic root of 280987742 is about 654.9816376959.

The spelling of 280987742 in words is "two hundred eighty million, nine hundred eighty-seven thousand, seven hundred forty-two".