52281390 has 64 divisors (see below), whose sum is σ = 146479104. Its totient is φ = 11693568.

The previous prime is 52281389. The next prime is 52281401. The reversal of 52281390 is 9318225.

It is a happy number.

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

It is a Curzon number.

It is a congruent number.

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, 7222 + ... + 12518.

It is an arithmetic number, because the mean of its divisors is an integer number (2288736).

Almost surely, 2^52281390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 52281390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73239552).

52281390 is an abundant number, since it is smaller than the sum of its proper divisors (94197714).

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

52281390 is a wasteful number, since it uses less digits than its factorization.

52281390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5361.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 52281390 is about 7230.5871130912. The cubic root of 52281390 is about 373.9231685617.

The spelling of 52281390 in words is "fifty-two million, two hundred eighty-one thousand, three hundred ninety".