280749490 has 16 divisors (see below), whose sum is σ = 577541952. Its totient is φ = 96256944.

The previous prime is 280749487. The next prime is 280749499. The reversal of 280749490 is 94947082.

It is a super-2 number, since 2×280749490² = 157640552270520200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (280749499) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2005284 + ... + 2005423.

It is an arithmetic number, because the mean of its divisors is an integer number (36096372).

Almost surely, 2^280749490 is an apocalyptic number.

280749490 is an abundant number, since it is smaller than the sum of its proper divisors (296792462).

280749490 is a wasteful number, since it uses less digits than its factorization.

280749490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4010721.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 280749490 is about 16755.5808613130. The cubic root of 280749490 is about 654.7964637681.

The spelling of 280749490 in words is "two hundred eighty million, seven hundred forty-nine thousand, four hundred ninety".