280501428 has 24 divisors (see below), whose sum is σ = 693004032. Its totient is φ = 88000384.

The previous prime is 280501409. The next prime is 280501439. The reversal of 280501428 is 824105082.

It is a super-2 number, since 2×280501428² = 157362102220078368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 280501395 and 280501404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 687300 + ... + 687707.

It is an arithmetic number, because the mean of its divisors is an integer number (28875168).

Almost surely, 2^280501428 is an apocalyptic number.

It is an amenable number.

280501428 is an abundant number, since it is smaller than the sum of its proper divisors (412502604).

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

280501428 is a wasteful number, since it uses less digits than its factorization.

280501428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1375031 (or 1375029 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 280501428 is about 16748.1768560044. The cubic root of 280501428 is about 654.6035539687.

The spelling of 280501428 in words is "two hundred eighty million, five hundred one thousand, four hundred twenty-eight".