281878380 has 360 divisors, whose sum is σ = 1063682928. Its totient is φ = 62270208.

The previous prime is 281878369. The next prime is 281878391. The reversal of 281878380 is 83878182.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (281878369) and next prime (281878391).

It is a super-2 number, since 2×281878380² = 158910842222848800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 4207107 + ... + 4207173.

Almost surely, 2^281878380 is an apocalyptic number.

281878380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 281878380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (531841464).

281878380 is an abundant number, since it is smaller than the sum of its proper divisors (781804548).

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

281878380 is a wasteful number, since it uses less digits than its factorization.

281878380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 45.

The square root of 281878380 is about 16789.2340504265. The cubic root of 281878380 is about 655.6729327100.

The spelling of 281878380 in words is "two hundred eighty-one million, eight hundred seventy-eight thousand, three hundred eighty".