280328732 has 48 divisors (see below), whose sum is σ = 521277120. Its totient is φ = 131712000.

The previous prime is 280328731. The next prime is 280328771. The reversal of 280328732 is 237823082.

It is a junction number, because it is equal to n+sod(n) for n = 280328692 and 280328701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280328731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 831668 + ... + 832004.

It is an arithmetic number, because the mean of its divisors is an integer number (10859940).

Almost surely, 2^280328732 is an apocalyptic number.

It is an amenable number.

280328732 is a deficient number, since it is larger than the sum of its proper divisors (240948388).

280328732 is a wasteful number, since it uses less digits than its factorization.

280328732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542 (or 540 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 280328732 is about 16743.0203965712. The cubic root of 280328732 is about 654.4691867108.

The spelling of 280328732 in words is "two hundred eighty million, three hundred twenty-eight thousand, seven hundred thirty-two".