281990740 has 24 divisors (see below), whose sum is σ = 603356040. Its totient is φ = 110667648.

The previous prime is 281990717. The next prime is 281990759. The reversal of 281990740 is 47099182.

It can be written as a sum of positive squares in 4 ways, for example, as 111218116 + 170772624 = 10546^2 + 13068^2 .

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 281990693 and 281990702.

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, 131955 + ... + 134074.

It is an arithmetic number, because the mean of its divisors is an integer number (25139835).

Almost surely, 2^281990740 is an apocalyptic number.

281990740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

281990740 is an abundant number, since it is smaller than the sum of its proper divisors (321365300).

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

281990740 is a wasteful number, since it uses less digits than its factorization.

281990740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266091 (or 266089 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 281990740 is about 16792.5799089955. The cubic root of 281990740 is about 655.7600407554.

The spelling of 281990740 in words is "two hundred eighty-one million, nine hundred ninety thousand, seven hundred forty".