1525363728 has 120 divisors (see below), whose sum is σ = 4605678432. Its totient is φ = 433746432.

The previous prime is 1525363687. The next prime is 1525363729. The reversal of 1525363728 is 8273635251.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 1525363728.

It is not an unprimeable number, because it can be changed into a prime (1525363729) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 532476 + ... + 535332.

Almost surely, 2^1525363728 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 1525363728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2302839216).

1525363728 is an abundant number, since it is smaller than the sum of its proper divisors (3080314704).

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

1525363728 is a wasteful number, since it uses less digits than its factorization.

1525363728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3109 (or 3096 counting only the distinct ones).

The product of its digits is 302400, while the sum is 42.

The square root of 1525363728 is about 39055.9051617038. The cubic root of 1525363728 is about 1151.1302631881.

Adding to 1525363728 its reverse (8273635251), we get a palindrome (9798998979).

The spelling of 1525363728 in words is "one billion, five hundred twenty-five million, three hundred sixty-three thousand, seven hundred twenty-eight".