525690 has 80 divisors (see below), whose sum is σ = 1568160. Its totient is φ = 125280.

The previous prime is 525677. The next prime is 525697. The reversal of 525690 is 96525.

It is a super-2 number, since 2×525690² = 552699952200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an alternating number because its digits alternate between odd and even.

It is a nialpdrome in base 9.

It is a zygodrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (525697) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 8881 + ... + 8939.

It is an arithmetic number, because the mean of its divisors is an integer number (19602).

2⁵²⁵⁶⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 525690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (784080).

525690 is an abundant number, since it is smaller than the sum of its proper divisors (1042470).

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

525690 is a wasteful number, since it uses less digits than its factorization.

525690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89 (or 80 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 525690 is about 725.0448262004. The cubic root of 525690 is about 80.7067585998.

The spelling of 525690 in words is "five hundred twenty-five thousand, six hundred ninety".