52781000 has 64 divisors (see below), whose sum is σ = 126247680. Its totient is φ = 20644800.

The previous prime is 52780997. The next prime is 52781023. The reversal of 52781000 is 18725.

It is a super-2 number, since 2×52781000² = 5571667922000000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46439 + ... + 47561.

It is an arithmetic number, because the mean of its divisors is an integer number (1972620).

Almost surely, 2^52781000 is an apocalyptic number.

52781000 is a gapful number since it is divisible by the number (50) 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 52781000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63123840).

52781000 is an abundant number, since it is smaller than the sum of its proper divisors (73466680).

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

52781000 is a wasteful number, since it uses less digits than its factorization.

52781000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1191 (or 1177 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 52781000 is about 7265.0533377257. The cubic root of 52781000 is about 375.1104859629.

Adding to 52781000 its reverse (18725), we get a palindrome (52799725).

The spelling of 52781000 in words is "fifty-two million, seven hundred eighty-one thousand".