505451280 has 160 divisors (see below), whose sum is σ = 1657893888. Its totient is φ = 127180800.

The previous prime is 505451273. The next prime is 505451299. The reversal of 505451280 is 82154505.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 304212 + ... + 305868.

Almost surely, 2^505451280 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 505451280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (828946944).

505451280 is an abundant number, since it is smaller than the sum of its proper divisors (1152442608).

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

505451280 is a wasteful number, since it uses less digits than its factorization.

505451280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1745 (or 1739 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 30.

The square root of 505451280 is about 22482.2436602755. The cubic root of 505451280 is about 796.5745622372.

The spelling of 505451280 in words is "five hundred five million, four hundred fifty-one thousand, two hundred eighty".