280620940 has 24 divisors (see below), whose sum is σ = 590223312. Its totient is φ = 112073280.

The previous prime is 280620929. The next prime is 280620941. The reversal of 280620940 is 49026082.

It is a super-2 number, since 2×280620940² = 157496223932967200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (280620941) 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, 2607 + ... + 23833.

It is an arithmetic number, because the mean of its divisors is an integer number (24592638).

Almost surely, 2^280620940 is an apocalyptic number.

280620940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

280620940 is an abundant number, since it is smaller than the sum of its proper divisors (309602372).

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

280620940 is a wasteful number, since it uses less digits than its factorization.

280620940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21897 (or 21895 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 280620940 is about 16751.7443867795. The cubic root of 280620940 is about 654.6965087799.

The spelling of 280620940 in words is "two hundred eighty million, six hundred twenty thousand, nine hundred forty".